This game is a prime example of what a WiiWare title should be. Given its huge limitations, titles on the service should not try to emulate full retail releases, but rather be simple, original and straight-up fun concepts executed well. Take a game like Jett Rocket for example. While it is a great game, in the end it just makes you wish it were a retail game so it could look better, last longer, and be overall bigger.
But then there are games which don't need to be bigger, and so are perfect for WiiWare. The Art Style games are a good example of that. There's five of them already, all very good, however one of them stands as easily the best: Art Style Rotozoa.

In the game you control that ... thing with tentacles you see in the picture above, maneuvering it around ... somewhere with the d-pad, and twsiting it clockwise with the 2 Button, and counter-clockwise with the 1 button. The goal of each stage is to collect as many "pieces" of the tentacles as you're told in the beginning (for example, in the first stage you have to collect 10 yellow pieces and 10 red pieces). Then 15 of each, and so on. Touching a piece with the appropriate color adds it to your tentacle, and touching it with the wrong color destroys your whole tentacle. You start out with two tentacles of different colors, and by the end you'll have five.
So basically, you have to move and twist around to collect little orbs, and avoid touching orbs with the wrong color. That's it. Sounds simple? Well, guess what, it is. But it's that special kind of simple that completely hooks you. It's so easy to understand, yet as the levels progress and you have more tentacles it gets very hard so you don't lose interest.
You know those kinds of games where you get so "into" them yet they're so simple you're almost playing on auto-pilot? Hypnotized, even? Like Tetris or Pac-Man, for example. Well Rotozoa is also like that. Music is nice and atmospheric and the graphics are simple yet stylish. It won't "wow" you, but it's very appealing. Like all Art Style games.

Regardless of what kind of games you like, you should try this out. And while you're at it, you should try out every Art Style game. But this one first, as it's easily the best.