So I picked up this game with the intention of letting him watch a little bit and talking to him about space.
After he went to bed and I was a few hours into the game I realized this same thing though... All I'm doing is going to a planet, consuming their resources and leaving. The only nice thing I can do is with other aliens and I can feed some animals but not all of them. You don't build anything on the planet and you end up destroying a lot of resources.
It's still a fun game, don't get me wrong, but the idea that after the game is over (which I'm not at yet) all that will follow my character is a gouge in every planet he came across just seems... sad.
I compare this to something like Minecraft where at least you leave structures and buildings behind, and just feel like it's kind of a sad game as well as an exploratory game. Which may have been the point behind it as well. Maybe that's the deeper meaning the developers want you to get.