I like the general idea, but I feel like it misses some communication, it feels like the oxygen should be visible, and running out, and also the bullets feel like I can spam them. The rotate character was a bit strange to understand, it felt a bit random at first, but then I got it. Then I believe there is some bug, I believe a dead enemy attacked me xD, and also not having some kind of hp or something felt like dying from one bullet was too much, more if you can't predict or block the bullets, etc. The shake on fire feels more like a bug not a camera shake.
However, I liked the game, the level design helps the switch directions mechanics in some way, and there are different enemy patterns, etc. I wanted more :)