Add simple, untested animation system.
Account for x-axis camera tracking in shake effect.
Incorporation sprite explosion effect.
Add star sprites.
Add resize handlers.
Add IcosahedronGeometry creation.
Add Icosahedron test.
Add camera roll effect.
Replace box meshes with icosahedron enemy meshes.
Add lives and life count indicator.
Remove overzealous replacements for 'replace' and 'scale'.
Add Vector3 lerp() method.
Add life power-up.

Slight increase to number of asteroids to compensate.
Add title and help text.