Such a charming concept with all of the elements working towards it! Definitely made me stressed as if I am losing oxygen right here and right now. It also has a great potential for replayability, and little details, like ending count, perfectly add to that. Reminded me a lot of a game called Minit, especially in the moment where I intentionally lost one round after finding the code to start a new save and call for help. Minit mainly consists of such interactions; something about this mechanic really scratches my brain. The fact that you got to recreate this feeling in your small project is really cool! Good job!