Certainly an interesting little game, gives a good bit of interactivity for a growth-based game. However, it did get fairly boring after a little while. I imagine this would be harder, but it could be interesting to create a bunch of set levels instead of the randomized placement of gems, and whenever you clear a board you go to another level randomly.
Gonna be watching this one and you to see what else you make though, heh, certainly some good art to go with the intriguing gameplay.