I'll start off by saying this is probably my favourite game of the jam.
I love the simple minimalist art style, along with the aesthetic and the music of the of the game as it creates a really nice atmosphere.
I really liked the enemies as well, they were all pretty distinct and their attacks were just the right speed that dodging them was possible but you could still get hit if you aren't paying attention enough, so if you get hit it's the players fault rather than it be some bullshit fast projectile. It would've been cool to see three different bosses but seeing as it is a jam I honestly can't complain as I think the boss in the game is designed really well.
What elevates this above other games where 'less health does more damage' is that the health and damage is linked to ammo. I think this is good because it dynamically changes the playstyle of the player from offensive to evasive depending on how much ammo they have. Overall, a great idea and execution of the jam's theme.
One question I have though is that I noticed that there was two sort of cross hairs, the small diamond one and the big rotating square one. Would your attack do more damage if the diamond was inside the square or am I imagining things?
Once again, I really enjoyed this game, five stars all round. It would be cool to see it expanded to add more puzzles and mechanic that build upon what you've made here. Amazing job!