Bombernauts

Bombernauts is a Bomberman-style online multiplayer battle game with fully destructible voxel terrain. The goal of the game is to use weapons and powerups to blow your robot opponents off the game world and onto the lava below.

The game has over 100 maps, the ability to drop in and out of online multiplayer, and an included level editor. Powerups are stackable so that you can build up various powers and use them in tandem.