Hi DoogieDog, i downloaded the game and had a go, i really like the game play, but found it very easy even on 'Insane' level i gave up at level 62 as it was getting a little repetitive. I think the whole game is a really good idea as i havn't played one that works the way yours does, maybe have it so it speeds up slightly faster as you go from level to level.
Some other ideas, you could have blocks that fall that you cant move so they are locked to the column they stared in this way you have to work around it.
I also noticed you didn't display any ad's on the actual game screen (they were only on the menu screen), i would have thought it would be good to get a banner on the main game screen also.
Anyway keep up the good work
Stu