In case anyone doesn't believe me, and still needs a source, Capcom's website says this about the game:
Wii™
Throughout the vibrant and distinctive surroundings, interact with a dynamic cast of characters and build their faith to re-establish order and beauty to a world laid barren by evil.
- New Widescreen (16:9) and 480p progressive scan support.
- Real-time fighting system and special attacks using brush techniques to decimate enemies and solves puzzles.
- Use innovative controls and the Wii remote to "paint" your desired powers.
- Fight against a wide variety of fascinating yet deadly enemies!
- Communicate with unique characters.
- Blend of stylized graphics and unique gameplay results in a rich and dynamic experience.
- Expand your god-like powers as you progress through the game!
I do think it's sort of funny that they don't list the PS2 among the available platforms, but I suppose given the product description it's unique enough to say "only on Wii." Also, it's awesome that on the page for the game they "aslo recommend" Zack & Wiki. ^_^