A small suggestion: Allow jumping down the platform polygons by doubletapping "Crouch".
My current thoughts about this would be to add another poly type that allows jumping down the platforms, so you have one that does allow it and one that doesn't.
So, parallax scenery layer(s) next?
I've actually played around with this and it was surprisingly easy to create a parallax effect with one distant non-interactable background layer now that I've added the framework for background polygons. But I won't add anything such until I figure out if/how someone in Polyworks would be able to tweak the layer's distance.