Could smell the iron lung inspiration from a mile away haha! I like the game play it's a very creative take on the theme, with taking too long costing the loss of oxygen and water leaking in, I think it's a clever idea to unlock new minigames are the game progress to keep it fresh and create more tension as the difficulty of them increases.
However I didn't know when I unlocked a new one or when the previous one became blocked, so it made the game feel unresponsive when i was clicking the previous minigame and nothing happened so i think would be useful to have some indications of what you can't and can access on the computer any given time.
speaking of the computer, I really like the diegetic ui of the read me file as well as the guy on the walkie-talkie acting as a kind of introduction, it reminds me of the iron lung movie and his tone feels similar to 5NAF phone guy lol.
Although since the game has a lot of diegetic ui elements, I think it would be neat if the timer and credits value had a similar going for them to make the ui feel more cohesive, but understandable given the time limit there's still an impressive amount of work put into this!
Great Work! : )