The tab text being black makes it hard to read, otherwise super cute!

Cute background but the tabs and toolbars aren't readable. I'd make both of these, including the active tab, colors less transparent to improve readability. Otherwise, very cute choice on the theme. One of my favorite GameCube games was Kirby Air Ride and the best Kirby mob are Waddle Dees without a doubt.

Yoo that's cute