Really nice twist there - I thought for a second it was just a two level game with the only link to 'not real' being that little message on the end game screen. I like the idea of the monsters actually being the victims and the developer being the monster. Really liked that angle :)
I think it would have been improved with a few sfx (appreciate you may not have had time to do full soundtrack) and the monsters on the shooting level seemed to appear out of nowhere rather than entering via the side of the screen. Other than that I really enjoyed it!