Wow, I just wasted so much time on that.
That was great. I turned colors down to 2 and lost for reasons unknown(only 58 blocks on screen, maybe because difficulty hit 10? final score of 45670). For such a simple game, that was incredibly fun. I liked the added touch of entire grey rows self destructing.
Isn't there a Nintendo DS game with this concept? Meteos, I think it is? It's a little sad(from the game industry's point of view) that it can be put into a flash game and be so awesome. Great work. The only bug I noticed was that the amount of rows that would shoot up from horizontal links seemed to be random, sometimes only a few, sometimes half the screen.