Great atmosphere, great flow to the game, too! The music is chosen very well, it fits the game perfectly. Also, having a proper settings menu is great, made it possible to run RUN on my potato of a PC.
My only criticism would be that at that length, it does begin to feel a little too repetitious after a while, and there was one time I was well ahead in the game and I got glitched into a gap, unable to move in any way. Also, I think the game over could be improved, won't spoil what exactly it is, but I think it could be done more effectively.
But that's minor issues, for a short project, this is very enjoyable!