Question: What shape are the games that are similar to My Little Flufties?

Context paragraphs:
Similarity (geometry): Two geometrical objects are called similar if they both have the same shape, or one has the same shape as the mirror image of the other.  More precisely, one can be obtained from the other by uniformly scaling (enlarging or reducing), possibly with additional translation, rotation and reflection.  This means that either object can be rescaled, repositioned, and reflected, so as to coincide precisely with the other object.  If two objects are similar, each is congruent to the result of a particular uniform scaling of the other.  A modern and novel perspective of similarity is to consider geometrical objects similar if one appears congruent to the other when zoomed in or out at some level.

Explosive lens: An explosive lens—as used, for example, in nuclear weapons—is a highly specialized shaped charge.  In general, it is a device composed of several explosive charges.  These charges are arranged and formed with the intent to control the shape of the detonation wave passing through them.  The explosive lens is conceptually similar to an optical lens, which focuses light waves.  The charges that make up the explosive lens are chosen to have different rates of detonation.  In order to convert a spherically expanding wavefront into a spherically converging one using only a single boundary between the constituent explosives, the boundary shape must be a paraboloid; similarly, to convert a spherically diverging front into a flat one, the boundary shape must be a hyperboloid, and so on.  Several boundaries can be used to reduce aberrations (deviations from intended shape) of the final wavefront.

Princess cut: The princess cut is the second most popular cut shape for diamonds, next to a round brilliant.  The face-up shape of the princess cut is square or rectangular and the profile or side-on shape is similar to that of an inverted pyramid with four beveled sides.  The princess cut is a relatively new diamond cut, having been created in the 1960s.  It has gained in popularity in recent years as a more distinctive alternative to the more popular round brilliant cut, in which the top of diamond, called the crown, is cut with a round face-up shape and the bottom, called the pavilion, is shaped similar to a cone.  A princess cut with the same width as the diameter of a round brilliant will weigh more as it has four corners which would otherwise have been cut off and rounded to form a round brilliant.  The princess cut is sometimes referred to as a square modified brilliant.  However, while displaying a good degree of brilliance, its faceting style is unique and completely different from that of a round brilliant.  The Princess cut had its origins in the early "French" cut, having a step-modified "Double-French" or "Cross" cut crown and a series of unique, chevron-shaped facets in the pavilion which combine to give a distinct cross-shaped reflection when the stone is viewed directly through the table.  The Barion shaped cut has now been renamed the "Princess cut".

My Little Flufties: My Little Flufties is a 3D life simulator similar to Tamagotchi published on Nintendo DS and Windows by Lexicon Entertainment.  The game is distributed by JoWood Productions in Europe and Dreamcatcher in North America.  The game title is "AniMates" in North America.

Chasse (casket): A chasse, châsse or box reliquary is a shape commonly used in medieval metalwork for reliquaries and other containers.  To the modern eye the form resembles a house, though a tomb or church was more the intention, with an oblong base, straight sides and two sloping top faces meeting at a central ridge, often marked by a raised strip and decoration.  From the sides there are therefore triangular "gable" areas.  The casket usually stands on straight stumpy feet, and there is a hinged opening to allow access, either one of the panels, but not on the front face, or the wooden bottom; there is usually a lock.  The shape possibly developed from a similar shape of sarcophagus that goes back to Etruscan art, or from Early Medieval Insular art, where there are a number of reliquaries or cumdachs ("book-shrines") with similar shapes, like the Monymusk Reliquary, although in these typically there are four sloping panels above, so no "gables"; a 13th-century example of this type is the chasse of Saint Exupère (see gallery of images, below).  The word derives, via the French "châsse", from the Latin "capsa", meaning "box".

Tamagotchi: The Tamagotchi (たまごっち ) ] is a handheld digital pet, created in Japan by of WiZ and Aki Maita of Bandai.  It was released by Bandai on November 23, 1996 in Japan and May 1997 in the rest of the world, quickly becoming one of the biggest toy fads of the 1990s and early 2000s.  As of 2010, over 76 million Tamagotchis have been sold world-wide.  Most Tamagotchi are housed in a small egg-shaped computer with an interface usually consisting of three buttons, although the number of buttons may vary.

Bouba/kiki effect: The bouba/kiki effect is a non-arbitrary mapping between speech sounds and the visual shape of objects.  This effect was first observed by German-American psychologist Wolfgang Köhler in 1929.  In psychological experiments, first conducted on the island of Tenerife (where the primary language is Spanish), Köhler showed forms similar to those shown at the right and asked participants which shape was called "takete" and which was called "baluba" ("maluma" in the 1947 version).  Although not explicitly stated, Köhler implies that there was a strong preference to pair the jagged shape with "takete" and the rounded shape with "baluba".

Robocasting: Robocasting or Direct Ink Writing (DIW) is an additive manufacturing technique in which a filament of a paste (known as an 'ink', as per the analogy with conventional printing) is extruded from a small nozzle while the nozzle is moved across a platform.  The object is thus built by 'writing' the required shape layer by layer.  The technique was first developed in the United States in 1996 as a method to allow geometrically complex ceramic green bodies to be produced by additive manufacturing.  In robocasting, a 3D CAD model is divided up into layers in a similar manner to other additive manufacturing techniques.  A fluid (typically a ceramic slurry), referred to as an 'ink', is then extruded through a small nozzle as the nozzle's position is controlled, drawing out the shape of each layer of the CAD model.  The ink exits the nozzle in a liquid-like state but retains its shape immediately, exploiting the rheological property of shear thinning.  It is distinct from fused deposition modelling as it does not rely on the solidification or drying to retain its shape after extrusion.

Yelovichnus: Yelovichnus is an "enigmatic" genus known from fossils of the Ediacaran period.  "Yelovichnus" was originally believed to be an ichnotaxon: its fossils, because of their "meandering nature", were initially thought to be feeding trails left by other life forms, such as annelids or mollusks.  Better-preserved specimens later demonstrated that the fossils were not true feeding trails, as there was no evidence of turning by the life form that supposedly left them.  The fossils are now recognized as belonging to an organism taking the form of "collapsed, segmented tubes", possibly an alga or a protist.  It has also been argued that "Yelovichnus" and similar organisms are xenophyophores, large but single-cellular organisms that exist today in the abyssal zone.  Due to similar structures found in their fossils, it is theorized that "Yelovichnus" may be related to "Palaeopascichnus", as well as "Aspidella" and "Neonereites".  The main difference between "Yelovichnus" and "Palaeopasicichnus" is the shape of their segments: the segments of "Yelovichnus" took the shape of "closed, ovate-shaped loops", whereas the segments of "Palaeopascichnus" were quite varied in shape.

Shape waves: Shape waves are excitations propagating along Josephson vortices or fluxons.  In the case of two-dimensional Josephson junctions (thick long Josephson junctions with an extra dimension) described by the 2D sine-Gordon equation, shape waves are distortions of a Josephson vortex line of an arbitrary profile.  Shape waves have remarkable properties exhibiting Lorentz contraction and time dilation similar to that in special relativity.  Position of the shape wave excitation on a Josephson vortex acts like a “minute-hand” showing the time in the rest-frame associated with the vortex.  At some conditions, a moving vortex with the shape excitation can have less energy than the same vortex without it.

Supporting paragraphs: My Little Flufties Tamagotchi
Answer: egg-shaped