Rumble Box: Tournament Edition

Rumble Box is a fast paced 3D action beat-em-up with a unique premise: all of the characters are made of simple objects which stay around in the level even after the character is defeated. The objects pile up, changing the gameplay landscape and altering your combat tactics. The game takes place inside a giant box, and the ultimate goal of the game is to pile up enough defeated enemies to get out of the box.