Games Like Conlutus

Conlutus is a short arcade adventure game featuring one large level. Collect coins and stars as you progress and manage you're oxygen levels to survive and beat you're previous high score. . 

You are a diver exploring a deep cave system trying to find your way out. You hog all the oxygen and try to make it out. The game loop is collecting coins in this one large map and unlocking doors to get the most amount of coins.