Use [1P - A/D] or [2P - Left/Right arrow keys]. Go BELOW the wave thingies to start. Use [1P- E] or [2P - Spacebar] to switch Skins! Use [1P - W] or [2P - Up arrow] to change direction. [!] Controls have been changed to fit the 2-player suite.
Only Player 1 can start the game or change gamemodes. If either of you loses all your lives, it cuts the match. Skins cannot overlap, so any confusion wouldn't happen. [!] Generic skin was removed due to a health bug.