I can't get over the first jump either, been trying for over 10 minutes on this one jump. Sorry guys. I know it's made in a week but not having SOME direction for this impossible jump is cutting the corners a bit too much. I've tried every combination of double jump and dash that I can see - the best I can get is she's blue and she's above the ledge but heading away from it so she can't land on it.
I even glitched through the wall to my death in my attempts.
As far as I can tell, you can jump, wall jump, and dash in any direction horizontally only. If there's a way to dash upwards to make it up the ledge, I cannot for the life of me, work this out.