Great job, I loved the art, especially the buttons for the keys.
I really appreciated the work you put into accessibility! I feel like most games just ignored that category, or did only a little bit. Meanwhile you had mappable controls, a jump sensitivity, and level select even when you haven't completed previous levels (so you can effectively skip a hard level). There was one minor oversight: in the settings menu you have one option that can't be reached by keyboard (only mouse): the option to reveal the secret key combos. Also, when you close the settings menu you go back to the main menu, so someone could be really close to ending a level, go to change the settings, and then have to start all over!