I've got to be honest here. This is my personal favorite game submission.
First of all, the soundtrack is TOP notch. The sounds are perfect for this sort of game and I love how it changes up when low on oxygen/health. The graphics and design are simple, yet charming and clean. Playing this really made me reminisce about the first time I played my favorite game, NieR: Automata (which may be why I enjoyed this so much idk lol). I played this for maybe an hour straight. I don't know if you plan on developing this further, but I do wish that you had the option to keep the gun you bought from the previous round (I was so happy with this 500-cost one I saved up for and had to go back to the default one the next round) or some sort of permanent upgrade to your character so your resource uses feel more impactful the longer you play.
Thank you for making this. I had a really good time.