Ver cool game! Honestly felt like I was playing a 2D Subnautica. I've always itched for more nautical underwater games of any sort, and this game hits that itch so well. While the visual changes between the depth zones were subtle, they really helped feel like you were going deeper and deeper into the water, and the music changes here helped even more, adding to the tension of going deeper and deeper. Collecting resources, while super simple, felt satisfying because of how limited your time is by the oxygen. The progression in crafting felt great.
I would love to see this game expanded on. Great job to all!