It isn't terrible, but it's also not all that great. Would have definitely liked to see more original characters used. How about a "custom theming" option? Have some already set aside, and then the option for the player to upload their own images to use...I think that would add to the fun.
It's like Tetris meets Jewel Quest....which is ok. It gets sort of dull, really fast though. Here are a couple reasons why:
1. I can randomly click through the entire game and still win.
2. I have to wait for new blocks to appear, no switching options
3. Limited selection of multipliers and no bonuses
4. Uninteresting characters