The Super Mario preset isn't right. It doesn't have any jump cutoff set so the variable height jump doesn't work. Also the max jump is set too low: Mario should jump 5 tiles by default, 6 if he's moving. Movement affecting jump height is another variable to consider.
I think you should have given Celeste a double-jump, considering how important the air-dash is to the game.
There's an "Instant Movement" checkbox that isn't interactible.
Btw, here's my build:
Running: Max Speed: 8. Max acceleration, deceleration, turn speed.
Jumping: Jump Height: 5, Jump Duration: 3, Jump Cutoff: 3, Max air control, air acceleration, air brake.
Camera: Zoom: 5, Ignore Jumps. I set look-ahead to max and damping to 1 but I could have more look-ahead but the damping cancels it out, but I want more damping because I don't like the quick camera movements when it switches the look-ahead on and off.
I enjoyed playing this game at the unparty at GDC. But, when I download the mac version here, my mac says this.