I played it with my sister (after finding out that the game was a multiplayer-only title after quite a while) , but it was kinda difficult to get what we were supposed to do.
The concepts behind the game are interesting and quite original, therefore they are in great need to be explained to the player. I'm also not that sure about having both the power to rewind the opponent and yourself, maybe the latter would be enough, but it's just some random thought.
I think you could work more on this to make it a small multiplayer gem (but you should add support for two player to play on the same keyboard), good job!
p.s.: 10/10 sounds effects