Thank you for such robust feedback and critiques!
To tell you the truth, the reason for button up jumping was because we originally were going to give it a charge as well -- however, we figured out pretty early on that that probably would have been too much for the player to reliably keep track of. We just didn't have a chance to update the input with 500 other things left to be done! We'll also see about adding an invert option for reverse turning after the jam.
Thanks again! :)