This is an engine. This is not complete and is very dirty and has little to none intstructions on specific sprites. WASD to move, Z to jump, Z in midair to Airdash, B to Boost. T to enter editing mode and move through levels. L to toggle Lag Reduction. N and V to look at debug data. I to change levels. I may be forgetting something.
Might as well share the things I have been trying to add/improve. Things have broken since Scratch 3.0 and it's been over a year since I have been on Scratch. Probably won't be back for a few months. Feel free to tinker, remix or add to your own as I have lost passion to continue this.