I love this game - great gameplay and style, but I feel it needs a little bit more guidance as to how to deal with threats.
So from someone who has beaten the hard mode here are some tips!
Tips for beating the game (& hard mode):
- spam flash the closet, yes it speeds up battery drain but it makes the closet close much faster
- when flashing the windows, I've found it works most consistently when you flash the monster, flash the other window and flash the first again
- change batteries often and quickly after you've dealt with something, even if the charge isn't very low
- you never have to look at the door, so don't bother, just listen for it
I hope this helps!