Actually a really good and surprisingly innovative endless runner. Although you should probably explain the mechanics better. When you said that jumping out gave you "more air" I thought you meant more oxygen, that you could run out of it if you're in the water too long; just say "you can jump higher". As for "not running into danger", I'd describe it rather as "don't run into an ice block, or ice spikes underwater" (or whatever they are). Something that was actually quite confusing to me was that I could fall from a level-1 ice block into ice spikes and die, I thought they were a form of "level-0 ice blocks".
Anyway, once I actually got it, I must say it was refreshing in its uniqueness and quite fun, although I'd give the player just a bit more time to react. And ofc add powerups, coins, a shop with upgrades, yadda yadda, to make it hook the player for longer. Then it could be a seriously great game.