The platforming feels kinda floaty, although that may be intentional. There were a handful of blue orbs that felt impossible to grab without dying (but maybe I just need to git gud).
You might consider adding a way to jump down from a ledge onto a lower platform. It might also be a good idea to sometimes prevent the player from moving left; this is often done in platformers to force the player to continue so that they can't go back if they missed something.
It'll be interesting to see how this one turns out. Good luck!