That was an extremely good idea. Kudos.
Please keep the 1 sec timeline switch in future jams.
A few suggestions.
Add coyote time when going off cliffs.
Make character physics a tad floatier.
Make viewing alternate timelines a toggle maybe?
Make outline of main timeline more visible.
Fun game. Did you use Godot?
I already have the "coyote time" in my todo list, actually I have everything you mentioned in my todo, something to implement something to experiment :D
The only thing that I'm missing is "Make outline of main timeline more visible." what to you mean with that?
And yes I've used Godot!