Great game!
I think it's a nice improvement from the first one.
I especially like the many nods to the tv series, for example some of the music, which will be instantly recognizable by fans of the show.
The biggest improvement must be the detail of the backgrounds and their variety.
Another good idea is the points system, which will make you go back to stages in order to improve your records.
Vibrant colors, neat details, interesting additions... I sure do wish there was a sequel! :)