Cool idea! I like how you have the oxygen on the right being consumed, making me feel a little pressure to move fast. The music also was really fun, I never got bored of it. However, the hitboxes were a little unforgiving and because of that, you had to be super accurate with the controls. But, the controls were a little floaty, which made it a little frustrating to play. However, when you complete a level, it feels pretty good. Great job!