Over at Desura, Only Human Studios is releasing regular updates for Ensign-1, an in-progress space combat game for Windows, Mac, and Linux.

Ensign-1 puts players in the role of a space fighter pilot who, upon returning from a colonization mission in another solar system, finds Earth occupied by a hostile alien force. Players have a variety of options when it comes to engaging alien threats, either in single-player or cooperative/competitive multiplayer modes.

"You can fight from the safety of your spacecraft, or land and exit to explore space stations and carriers on foot," Ensign-1's developers explain. "You can commandeer any spacecraft in the game, no matter how big or how small. Defend an asteroid base, or take the fight to the enemy with a huge mothership, friends manning turrets, it's your choice."

Ensign-1 is currently available for $4.99, but will raise in price as it nears completion.