Very cool ambience. The game looks and sounds great, underwater character movement feels good (not counting movement at water surface), and I can tell a lot of work went into the level generator. I really liked how it all works together.
I think there may be something wrong with the junk placement generator. Sometimes there's no junk on the map (or on entire half of the map?), sometimes junk falls out of the air, and sometimes junk is embedded in walls, but can still be picked up if it's close enough to character hitbox. I couldn't complete the first day despite trying multiple times, there's just not enough junk to collect before running out of air.