A game of exceptional quality.
But still, because it's a kiddy game does that mean it's bad? Nope. It matters if it's fun, and Sunshine delievers there and is actually quite innovative.
The game is a little short, far shorter than Super Mario 64, which is stupid. But even so you will find yourself enjoying it from time to time. Plus it has nice graphics and sound to enhance the experience.
All in all I say this is a worthy purchase now that it's $20. So go out and buy it if you own the Cube.