Does no one here care about Gumboy and his Crazy Adventures?
Gumboy Crazy Adventures is good fun. Gumboy Tournament sounds very different, and I haven't really been interested, but for $5 I might be persuaded, despite my dislike of Steam.
If you don't have either than $5 is an absolute steal.
Crazy Adventures is a bit weird in that the goals of the tutorial levels (of which there are many) bear absolutely no similarity to the goals of the 'real' levels. It's more like the tutorial is a bonus game type. The proper levels have some absolutely gorgeous graphics and sound, and can be a bit magical at times. Fairly unique, beautifully presented, and definitely worth the asking price.