Two members of the Skymap Games team are multilingual. We can translate the game (and its humor) effectively into Spanish, and Greek. For other languages, we will need to hire localization services. Should our Kickstarter exceed it's goal, we will be able to put extra funds towards localizing the game in other languages.
We feel that local co-op fits perfectly with the game, and we're sure you'll have a blast fighting alongside a friend from one couch. Unfortunately, online co-op is a wholly different route that we did not feel fit very well with the game's playstyle; there are no plans to bring online co-op to the game at this time.