Like the old school feel to the game. The possession mechanic has real potential for some fun puzzles. My only gripe is, as other people have said, is the jumping mechanic. I found myself getting frustrated with getting the timing right. Plus having to press the key in the opposite direction I wanted to wall jump took me a bit to get. I was expecting to have to press the key in the direction I wanted to jump.
Other than that. Enjoyable and a fun throwback to old school platforming.