Really interesting idea, hard as hell tho. Not having checkpoints and having to start from the begening is brutal.
But regardless, you managed to create and interesting concept. I just wish you could expand more on it, like have both ying and yang be playable, just interchange between them and have them complete a puzzle.
The movement in yang's side is really fun, going full speed around is just plain fun. Having to jump with C is not, and clearly walljumping is also a big thing here. But hey, I know from experience wall jumping can be hard to achieve, especially since you only got 48 hours to develop. (If you want an example, play my game "What a Masterpiece", and see for yourself how awful mine is lmao)
I just expect a v2 with sound and a better wall jump. I would play the entire thing, start to finish, no matter how long it is.
Overall, it think you did really good. 3.5/5. Would totally play a full version of this with a nice little story.
PS. The art and effects are cool as heck, they are pleasing to look at, fell powerful on both sides, and are well animated. Just wished the bridges followed with the ground,
PPS. The black and white platforms were a wack, they didnt follow the rules all the time. For example: the white guy cannot go thru the black platforms, but the black guy can and viceversa. Why can the black guy stand on a white platform? Wouldnt he fall thru?.
Its just a small detail, but it kinda bothered me a little bit, still it doesnt take anything from the experience.