Hey there, I think you have fun idea with this high speed character but I had quite a struggle with platforming due to it.
The camera doesn't show enough of the level, so the slope jumps had me aiming to land somewhere I couldn't see, taking a leap of faith.
The character also feels very sensitive, for example when I jump, it almost launches me through the level (same goes for the dash). So, it becomes hard to react and land on platforms.
If you are going for a high speed character, I think all you need is to tweak some values around the character and you can make something fun out of it!