Of Mimas is a single player shooter that sends the player through a set of 5 large randomized dungeon levels. Each level has multiple bosses and a unique set of enemies to fight off.
The end goal is to find and save whoever it was that sent the distress signal.
Along the way you can collect numerous crystals and add-ons to your ship. The players energy both works as a source of energy for the weapons and as the source for the ships life support. The player can find charging stations and respawning stations throughout the dungeons.

A small grey lump of ice and rubble circling Saturn, or at least we thought it was.
Now covered in an orange cloud of dust from centuries of mining,
this moon has provided the solar system with a steady stream of precious elements.
Making it the by far the most successful private attempt at colonization ever.

But something is not right on Mimas.
For decades no one has been allowed to visit the moon
and rumours are that no one is allowed to leave either.
Not that anyone would know.
Direct contact with the colonists was unheard of until now.
A week ago you received a distress signal from
a man you presumed dead a long time ago.
The message came from Mimas..

So here you are, hiding in a hacked automated mineral transport vessel about
to land on Mimas. You owe him your life but he better be a in a lot of
trouble to have dragged you into this...