The concept intrigued me, and the prototype didn't disappoint in any way. Your concept is simple yet ingenious at the same time and I can't wait to see where you take it from here. I was a bit confused on the gamepad controls at first, and wasn't sure what was happening the first couple of times my character seized up, but I also feel as though those moments may very well have added to my overall experience.
I felt a ramping tension and compounding stress as the hero climbed further out of the dungeon, and those little narrative segments between each level helped to reinforce that feeling incredibly well.
Also, props for capturing some Lovecraft vibes in a way true to Lovecraft. Some of the more cryptic dialogue made me feel like I was screwing with something that humans were really never meant to know. Not something many designers can do well