Second mashup: Samsara.
Have some things on screen with a little movable guy.

I decided to try Artemis just for kicks, but it's feeling pretty heavy weight
and annoying, so I may rip it out and rewrite everything before I get much
further.
Nixed Artemis; too cumbersome.

Wrote a new simpler entity system, which allows the use of concrete entity
classes (heaven forfend).
A whole bunch of rearrangements and progress.

You can now be eaten by a frog, and respawn.
Step into my lair, said the spider to the fly.

Also a bunch of other improvements and whatnot.
The beginning of some random level generation.
Some aesthetic improvements.
Put spider to sleep after eating.

Other tidying, etc.
Inter level progress, backtracking, etc.
Mates, other tidying.
Put a default stroke/fill in the Viz.
Limit the lifespan of our protagonist(s).
Start with a nest on zero. Randomly orient frogs.
Fixed some issues with moving protag between levels.
Fixed some hairy issues with overlapping callbacks.

This sort of thing is always a bear.
Allow frogs to eat spiders.

Will probably revamp things to cause the frog to eat them as soon as they jump
into range rather than the next time the player moves.
Various tweaking, fixing, improving.