Jamestown (Legend of the Lost Colony) is "a neo-classical top-down shooter for up to four players, set on 17th-century British Colonial Mars" [as defined by its official website].
Its style is similar to classic arcades ("handcrafted pixels") and the action is like many shoot-'em-up, but it features an inventive story, 4 different types of playable ships and (local) multiplayer for up to 4 people on the screen at once.
Various "extras" are all included (different difficulty levels, secret scenarios, unlockable ships, etc.).
It received a "honorable mention for Excellence in Audio" during Independent Games Festival 2011.