A Pretty Good Game

This is a good game overall. I really like the graphics and atmosphere, it seems happy and positive, with the little unintelligent chatspeaking blobs. The music and sound effects are adequate for an arcade game, you don't need anything more, or anything more detailed. The story of the game exists, so I'm not complaining about how lame it was (:P) but instead complimenting you with the ability to implement story into such a simple arcade game. The game itself is fun to play and easy to learn, and when you start, the warnings like "Reach teh line!" and "King not happy!" are quite useful if you don't know what's going on. Maybe offer some more in-game pointers, though, like which mubblies should be used for what, and a pop-up when you first land a red block informing you that it will explode (for people who skip the instructions ;D)
The online highscore table was definitely a plus, probably the most vital part of the game. Without it, people would probably stop playing after ten minutes. Including this causes people to become competitive, one of the psychological aspects that draws people to gaming.
So, overall I'll give the game a 5. Because it's really well-made, but extremely simple. Not that that's a bad thing, but not that that's a good thing, either ;D