A portion of a Wiiware World article:

There are six levels all told with four stages each. It plays very much like an old 8-bit platformer with lots of jumping, but instead of jumping on your enemies heads you shoot them with a shotgun (not terribly sporting since they’re unarmed, but you’re a cowboy, so I guess it’s okay), oh and you can eat apples on the way, lots and lots of apples.