I like what you've created here, it doesn't feel like an indie game nor a demo, it's plays like an atmospheric horror which I enjoy and with the addition of puzzles you had me hooked.
The occasional jump scare kept me on edge and it helped to maintain a scary atmosphere, never sure is I'm being played or an actual scare is coming.
I didn't realise until after playing but you created a pretty wicked HUD too.
All in all your game was a pleasure to play and it made me sweat more than the average gym session.