Another reason for why it reminds me of Outpost - it's purely a simulation / management game, but you also have to contend with rebels that steal some stuff:

That and you can build a Rec Center, which is a little more Outposty than the standard mines/labs/factories that most similar games provide

The shuttle management and the names of the planets remind me a little bit of Alien Legacy, but it's probably just coincidental.

Though Alien Legacy also had you build orbital stations before going onto planetary surfaces- as per MobyGames' caption for this screenshot: "The game automatically builds space stations for each planet, hence SSPhoebe is a space station around Phoebe"
