I like the idea that you need to play the same level twice but under other circumstances. This mechanic is the strength of this game and i would have liked to see more ideas around this mechanic. Such as platforms that only one character can walk on, or you destroy the level with the white character and then you have to beat the level with the black character. With that you can keep the same level intersting with the black charakter.
It's ab bit difficult to get into the controls. But as soon as i understood everything, it was no longer a problem.
All in all, i enjoyed playing your game. Good work.