As the others said...
...it is way too fast. Nice concept, yet requires godly reflexes and memorisation OR failing some of "encounters" many, many times. I did the second thing, memorising moves against Clown during something like thirty tries, only to get killed when finally I could kill him but wasn't quick enough to hit spacebar on time.
Yet I succeded after few next tries, killing him - a challenge indeed, but I don't know if there is any fun in it.
Six for the concept. And making moves in last stage easy to memorize, so that mostly their number was a problem. And speed.