This was cool! The game has a pretty good atmosphere to it, which I enjoyed a lot and the music was very nice. My only complaints are that the music just stops once it finishes and doesn't loop (which means playing the game in complete silence) and that it feels like you're mostly just swimming around the majority of the time, not doing or finding much of anything. I also think it would be neat if you could refill your oxygen somewhere because you can just get locked out of progression sometimes if you're not fast enough. Other than that, great work on the game!