This is really well done for a game jam game. The execution of the 1-bit design was done in style, and I think the puzzles were just complex enough to still be pretty easily solvable. I think the ring one was my favourite; the way you gave the hint to the solution was really clever in my opinion. My only complaints are relatively petty things; I wish there was a little more to the alien fighting rather than just being a minor chore on my way over to the next puzzle destination, and I also noticed the melee attack hitbox was pretty finicky (sometimes I had to move pretty far away from an alien to get the attack to land). Other than that though, this is a really cool experience which I'd be interested to see more of!