I had initially only planned on the one level, but a couple people have suggested more levels with more controls available and I kinda like the idea of adding more complex controls in later levels such as E to flip a switch or G to swap gravity.
Viewing post in Get Your Controls Back! jam comments
Great! I could also imagine to add SPACE for jumping. Or if you need more: R,B,Y to activate the red, blue and yellow switches... With all of this you could probably design quite a few interesting levels. The more items the less straightforward it gets, since you don't know anymore what you should get next, while having more options to do something already. (If you continue this project and like to have me contributing level ideas, just contact me, e.g., on Twitter or with the form on my webpage. That could be fun. :)