I can't walk up stairs. If I climb up a couple of steps and find myself unable to proceed, I am no longer able to walk back down the stairs either. I get locked on any flight of steps that are more than a step or two.
It's possible to wriggle your way back off the steps (easier with mouse and keyboard), but move at the steps parallel and as straight as possible, you shouldn't have that many issues (and don't stop moving until you're all the way up.
That being said, the stairs are being reworked for the big update coming in a few months to be more consistent, including the layout in some of the more problematic levels like Jupiter Vision. I appreciate the call out, and I want you to know that I am actively working on it.