The Erichus Ghost begins to hound you the second you mine a single bit of fuel from a moon. There's even a gun that shoots tentacles! Meanwhile, grenade launchers can shoot rounds that resemble Mario's fireball, cluster bouncing grenades, and even mice and pigs.
The game receives semi-regular content updates and bugfixes, with the 1.4 Bounty Hunter update as the final update as of June 2019. Beta was released on December 4th, 2013 for all who preordered the game, and the final game was released on July 22nd, 2016.