While the main campaign is single-player focused, there is a separate co-op mode that allows up to three players (locally) to team up and fight their way through some unfriendly alien hordes. Each player controls one of the three dwarves - Forcer, Smashfist, and Shadow - and must utilize their dwarf's unique abilities to fight off their foes.
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In the main game, you control each of the dwarves - Forcer, Smashfit, and Shadow - as you battle the denizens of the foreign world. If the names were any clue, each of these brusque characters has his own unique set of abilities, which you'll have to choose how to employ in order to win the day. Think X-COM with Dwarves.