This is really cool! My main complaint is that your deceleration/air brake stats seem to be the only things that have any influence on slowing down and holding the opposite direction feels like it has no effect until Kit decelerates on her own. This makes jumps using the Meatboy presets feel really weird and much less precise than they are in the actual Meatboy game.
Other than that there were a few "juice" sliders, namely the two for squash & stretch, that wished I could set to be less than 1 but still more than 0 since once they hit 1 the effect was already a little on the strong side imo. There's also a couple other aspects of the various mechanics that would have been nice to be able tweak, but at that point you'd be expanding the scope of this project and honestly those are more nitpicks than actual criticism.
That aside, it's really nice to be able to get hands on with mechanics like this without having to learn Unity, GameMaker or Godot to do it.