Wow, thank you for all the great feedback! The theme idea was definitely inspired by cave videos I had seen, particularly this one by Jacob Geller. If you haven't seen it, its worth the watch.
I hadn't tested with Linux either, although it was in my original plan. So I'm glad you got it to work somehow!
I'm not personally a fan of oxygen mechanics, but it definitely fits the atmosphere and I would like to have more scares like you mentioned. Likely to push the player forward/mess up their platforming (making it more difficult under pressure). A close example i'm thinking of is the cat ghost from Animal Well if you've played it.
It looks like you found my easter egg too! There's no collision on those tiles because I wanted players to be able to walk inside the hole. I went back and forth on making the black section transparent, but it just looked too goofy to me. The holes are a reference to Junji Ito's manga "The Enigma of Amigara Fault", where people are inexplicably drawn to holes in their exact shape that get more narrow as it goes, causing people to get stuck.
Thank you again for playing, and I'm glad you enjoyed it! Having even one person play or have a good time was my goal for a first game :)
