Great game. Having the air meter balance how long you can be underwater and the life meter let you know how close your cutting it is intuitive and interesting. On top of that, I like your choice of sound effects.
Some feedback:
- I feel like this game could've benefited from background noise. Being above water was too silent compared to underwater.
- Having a separate scene for the menu would've been good.
- I felt like the things on the floor were gold. Upon picking them up, the first thing I looked for was upgrades. Implementing those would've been great.
- If possible, include WASD controls as a second option to arrow controls.