Hi Jon,
Could I ask which keys you assigned? Did the controls menu just reassign the key to another random key or was it completely blank?
well I was trying to assign SPACE to jump... looks like you can't reassign that? I was also trying to assign to SHIFT and CTRL but it wouldn't let me.
I just tried binding control keys to SPACE/SHIFT/CRTL, and I can confirm that it does not work. I'll be sure to fix it asap. Thank you for bringing this bug to my attention!