The visuals are amazing, the music may be a bit too pitched for my taste, but it works. The switching mechanic was fun, if not intuitive at first. A better explanation of what to do with S and Spacebar would have helped.
I would have lived the "arena" to be a circle like the waves you emanate, so that the ghosts have all the same distance but different speeds, but other than that, no complaints!
GJ!