I didn't expect to get so engaged by this game at first, but I loved it !
Overall everything fits really well together. The sound design is great and creates a good tension in the game !
Even though the mechanics are simple, they are way enough to still have time to enjoy the experience.
I played up until ~1100m, and right when I wanted to stop playing I discovered the oxygen sound effects, and the gallery. Nice touch and polish for this game :)
Keep making those good games !