Game: Magic Land Heroes: Ultimate Sunshine Fighters of the East
2-player co-op game in which you try to defeat an endless swarm of enemies, all the while maintaining your connection. Beware, if the heart player dies, it's game over! WASD controls the heart player, which can also shoot using UHJK. The blue player is moved with the keypad, and bullets can be fired using the mouse. Gameplay video: http://www.youtube.com/watch?v=6HrczZLNdNY
10 little pigs: The game uses 10 or more buttons or keys for gameplay-related actions (no pause or anything else).