Ice Age 2: The Meltdown
Ice Age 2: The Meltdown is loosely based on the movie of the same name. The game takes place in prehistory - you play as Scrat, the hapless (but not totally helpless!) proto-squirrel, helping your friends escape the coming of a huge flood.
In the Windows version the WASD keys move you forward and back, left and right, and the mouse controls camera movement and some actions. Scrat has a few special moves as well, such as sniff, his spin attack, a double jump, a ground stomp (useful for breaking ice), and a roll attack. Much of the game consists of hunting down acorns and other special nuts for health renewal or for unlocking bonuses. There are a few mini-games within the game - you can play as Sid, zipping along an ice slide while avoiding obstacles; there's also penguin-bowling and a mini-game where you "shoot" at monkeys to regain a walnut that was whisked out from under your nose.
