A preview of local multiplayer. The co-op mode follows typical arcade rules: player bullets don't hurt and when one player dies the other is left to play out the game solo. Bullets push the players around quite a lot, so it pays to coordinate your efforts to some degree to avoid inadvertently pushing your comrade into hurty things.
Competitive modes are still on the cards but will probably deviate from the obvious approach of transplanting existing characters into a death-math scenario. Pitting the default robot characters against each other results in quite chaotic play where the best strategy is often to spam bullets and leap around randomly. It might turn out better to have quite a separate set of characters and rules for this purpose. In any case, it will also be possible to invent silly 4-player party games using the editor.