Hey,
I would so much want to like to this game but it's nearly unplayable for me. I spent three different tries (had to restart the game) to find a way in the darkness but got frustrated as I could find anything reasonable to do.
It looks promising but the darkness is too much. Maybe you could have added a spotlight or something, small light sources for player to navigate (other than crystals) or something. I don't want to shoot with the gun to create light it's just too short.
I didn't see any enemies so I probably missed a lot of the game.