I enjoyed the overall art style a lot, same goes for the core concept of the game of almost painting the environment. Despite this, I think that the game is a bit too frustrating: there's always the need to proceed in a very tentative way, since the discovery/light radius is quite small, such that most of the time you just die in some unexpected ways (often for the slippery movements of the character) and you have to sit through your tentative gameplay being played in reverse.
I really like the idea behind the game, but I think that the rewind part would need a max amount of seconds, cutting some parts of it if it's needed. It would make the whole experience smoother. Apart from this, there's been a lot of work involved in the game and it shows, so keep going like this. Great job!