Oh neat, if you hold R you can spew out dozens of your ghost self in a matter of seconds! Anyway, I made a game just like this for last year's GMTK game jam so it's neat to see a different take on the idea. I like the way you could see less and less over time, and how one ability (the wall jump) really opens up the map and gives you extreme mobility, revealing a pathway at the beginning of the game that was there all along. I also liked how getting hit drained your time rather than say, immediately killing you.