It's a fun platformer! I got to the test level and I tried out the high speed mechanic and it actually feels pretty satisfying to chain rolls and high jumps and dashing together. Though I wish you implemented it somehow in a puzzle, since it feels quite nice to do those mechanics! One nitpick on the controls is that the dashing sometimes doesn't register correctly. Trying to do shift + space at the same time in the air sometimes gets ignored and I lose momentum?