This is an extremely unique and interesting concept.
It's pretty fun getting a handle on the movements, and flipping flawlessly between human and bat form!
As another commentor mentioned, the count get stuck on walls, especially around corners.
I had this happen quite a lot - in fact, the majority of my "deaths" were me turning into bat form while stuck just to restart the game.
Screenshot attached below shows an example.
I also think it would be nice to avoid insta-death for bumping into a wall as a bat, being forced to start all over again; but I'm guessing that was a deliberate throw back to the old unfair games of yesteryear.