Yeah, Ive already planned to extend it beyond the scope of the original with end of level bad guys and bonus levels. Im also adding extra bonuses within the game itself like multiples for using the same color multiple times in a row and so on.
Ive give it quite some thought already. The finished game will be similar in basic gameplay mechanics, but with a lot more to it. So far the working title in my head is "Joolextreem"