So I wasn't able to beat this, I tried for about 40 minutes but never found the thing I need to open the walls. I think the premise of a guy being stuck in a cave is neat and it absolutely feels claustrophobic. The itch page says the controls are supposed to not be intuitive, but I got used to them rather quickly. The real pain is the stamina system. I felt an desire to close the game every time my guy ran out and I had to wait, just listening to the panting noise. It gets annoying really fast. Is there a reason for the stamina bar ? Are there enemies later on, or is it just to limit how fast you can go ? If it's the latter maybe it would have been a better idea to cap the movement speed so you can't reach ultra sonic speed with spamming walk forward, which is the fastest way to move as far as I know.
Also I don't know what happens if the timer runs out, because I always got stuck and had to restart before it ran out.
Overall I would say it has a nice atmosphere, interesting movement, and funny faces. Didn't like the waiting around and listening to breathing sound though.