Hello, a really nice platformer! I managed to get a D rang in my first try although I did take some more risky paths. I though the controls are a bit heavy and the jump too high - at least I felt that on some points I jumped super high and on the others not that much - maybe it has something to do with the slope or speed - idk. I also liked the explosion when you fall from the course, it reminded me of Zelda Windwaker.
Also, an interesting choice to program in unreal engine, respect!