I felt the jump scare at the end wasn't earned, I think a more subtle approach would be appreciated.
I really enjoyed the ambience, you have a knack for that. I would like to see the monster incorporated like how you do the ambience, make you dread it and think about it long after the game is done. Like have it follows closely behind you without making a noise. That would be scary. Other than that, this is a REALLY impressive first time submission.