I have always liked this game, the only thing I never liked is the user interface of the galaxy screen, if the galaxy map was changed to look more like the NextColony galaxy this game would be perfect.
As far as Dark Matter, it would be fine if you made it a trade able token on either SMT or Steem-Engine, but the only way to get it would be through deep galaxy explorations and through questing, attacking space pirates or some random events like that.