Very cool game, especially for a first jam! Short, but sweet. I love the idea of programming the enemies as the main way to beat them; really neat idea.
I got stuck at the second guy for quite a while; I found the first and third bosses much easier to understand. Maybe it would be helpful if he started a little closer to the pit so that it's visible earlier on?
I also feel like the hitboxes are pretty big and could be telegraphed better (to avoid the player dying when seemingly touching nothing); usually it's better to make the hitboxes slightly smaller than the objects they correspond to, rather than the other way around, so that the player thinks "how did I avoid that hit?" instead of thinking "that didn't even hit me!"
I love the boss introductions. Super stylish, both visually and aurally. And the note from God at the start got a chuckle out me.
All-in-all, very solid first jam entry. Great work!