I haven't played super many games, yet, but this currently is my favourite game of all!
The only negative criticism I have is that you have to commit to any structure because you can't delete them (I think?) and also I couldn't look up the recipes after the first tooltip anymore (I had forgotten the ice cream recipe as I focused on bread).
Other than that, I actually would consider buying this if it were longer and maybe a little bit more difficult (I really didn't have to use rockets or focus on the actual rotation of the planets because by the end every planet had something (full moon, cheese) that would make it "free from maintenance" for one or more types of structures.