Top Critic Average
As long as you can accept its learning curve, Battery Jam is a fine multiplayer game. There are plenty of things that can be done, and it takes a while to get everything down before you can start playing and enjoying yourself. Once you understand the game, you'll find that there's some depth to the chaos, and even though there's no real meat to the game beyond local multiplayer, you'll enjoy the short bursts of fun it provides as a buffer between other multiplayer titles in your possession.
The lack of online multiplayer would be easier to excuse if local multiplayer had a little more meat to it. With that said, it's still a very competently made indie game that's fun to play in short bursts. Just don't expect too much depth from the gameplay.