Well done with the creepy atmosphere! The ambient sounds and the textures that looked like they might be made of rock or something more organic helped with it. I liked the "combat scene", too.
Criticisms/Suggestions:
The flashlight flickering was a little bit spooky in the beginning, but when it happened constantly, it got mostly annoying.
Holes were scary the first time since they were so strange, but once you fell into one and just got instantly teleported back a little bit, they lost their edge. You could have something weird and scary happen when you fall into one, like some hard-to-understand visuals and audio, or having the walls surround you and either shrink tight enough to crush you or grow wider so you get to experience vast emptiness. Or what ever you can think of!
The puzzle was hard to make sense of, I wasn't sure where I ended up when I dropped into the pink/purple hole. I just brute forced it.