The game is a bit difficult to handle. The platform area was a bit off, I think your best option is to move friction off the walls so the the player no longer sticks to them. The undertale part was also pretty hard to do, although I've never played that game so I have no experiance in those sort of mechanics, I might just be bad. Also there are a few typos, in the text.
I did like the concept and the approach on story telling, I think you were going in the right direction.