Super unique feeling theme - the idea that I can't jump and so every venture deeper is permanent was really interesting especially with the limited light. Dying to spikes felt really frustrating, especially with only having A/D to try and dodge them.
The sound that is there is ominous, alien and creepy - loved it, but overall it feels a bit empty and lacking.
The title/tutorial wasn't very obvious that that's what it was, I ended up clicking the start button by accident.
If you crouch (S) in the tutorial/title area you can get inside the wall on the right