A lot of the critique I got have alredy been mentioned by others, but I found this game very dark. That, coupled with keeping the camera close to the player made it hard to see a lot of the enemies before it was too late.
I kept forgetting that I could teleport, which made me die to being swarmed by enemies way too many times. Maybe if it was tied to one of the item slots instead of a separate key that I would have to remember. Or maybe I'm just bad at video games :P