The dark levels introduce walls of flesh and bone.
Knock out single chunks, or kill the head and watch the rest explode!

Aliens!

Aliens have to have googly eyes, right?

Here’s a theme I haven’t explored enough in my games: Space!
I’m thinking about enemy formations that involve a lot of orbiting around each other.

Jellyfish!
60fps is smooooooth.

Some foes, like the pufferfish, also have specific attack animations.

I’m currently animating the foes I drew earlier.
Here’s a small sample: