Having to survive being stuck in a vent is a cool concept! The music as you run out of oxygen feels like the theme of sonic drowning. It gave me a similar panicked feel which I felt really fit the game. I didn't realize the vents were randomly generated until my 3rd attempt when the exit spawned fairly close to the start. Maybe needing to find a way to unscrew the vent would have been good to prevent players like me from lucking out with the generation. It was a little difficult as is though, as the oxygen felt like it was always at the edge of how far I could crawl before needing it. Which does add to the panicked feel. But if the particular path you went down happens to have none then you're just doomed with no hope of reaching another. That said, the whole atmosphere of the game really captured the panicked feel of being stuck in a vent and I really enjoyed playing!