you can pass the mid-air rescale jump by jumping while big, and then quickly rescaling to small (get the height from the big guy and the distance from the small guy)
Oh, I've got it now. Thanks. I thought that could also play with physics. E.g. multiply big's velocity if it's mid air. It could be a nice "catapult" mechanics.
Once I've read this I was able to finish te game. Looks like the main mechanics was a bit confusing for me. It feels pretty satisfying to play. Good job!