Nice music and cool presentation, I like having the controls hint button on the screen, that's very good. Would be nice to have an in-game volume slider!
Puzzle hints are a great idea! And the writing gave me a laugh.
The use of lighting really works great.
I think that it might be a good idea to make it so that you can turn all the way around to see where exactly the enemies around you are without stepping time forward. Then you can just bind a 'wait turn' key. That way the behaviour of the enemies is a bit more clear, and the player will understand why they die a bit better.
Short, but all the levels work great and over all it's a very robust experience! Great job!