The GFX in the demo are bright and happy, and the level design is deep. Difficulty ranges from easy to medium, so you won't have a hard time beating the levels. It was made before the advent of AddMusic, however, so it uses the original SMW soundtrack.
Graphics are simple, but colorful. Fit very well with the Yoshi and Kirby rips here and there. Level design is enjoyable, and while this didn't have any custom music due to its age, the vanilla soundtrack worked just fine.
Do check this out whenever you have nothing else to do.
I wish cwiarl would have continued it.