Game's really good, love the graphics, and as a diver myself I have to say the physics are on point. Some feedback/suggestions:
- The level up coral is indistinguishable from other corals aside from placement, a brighter hue could help with this.
- Some low volume background music should help the gameplay feel more complete, should keep the focus on the ambient sound and sfx.
- Some algae look cut at the top, dunno if its an issue with how the spritesheet is loaded or just how the graphics are.
- Got lost on where to find the exit on third level an ultimately gave up, I guess thats the idea.