Good initial concept to take away moves from the player, but it just ended up with me standing and waiting to get back the spacebar and my right arrow key so that i could make the next jump... It would probably be better if the randomness were toned down a bit so that maybe the keys are turned off in a specific sequence and you have to plan your moves accordingly so that you can still complete the challenges even with a certain key gone. As of now, all it does is make the player wait for the right combo of usable keys.
Again, I really liked the concept, but thought it could be a bit more refined! Nice job with the game :)