This is the first time i've enjoyed the controls changing on me design idea. because designs are small it's only a small time to parse the new controls, i would like some kind of timer before the next change though :)

The concept itself is pretty fun. Although what isn't fun is that there is absolutely no indication of what the controls are and alot of guess work into controls is hardly a good thing. Perhaps adding a timer as well to atleast set the player to ready him/herself with. 

Overall, its a pretty good experience.