I think there should be quite a few things added. There should be a policy forcing you colonists to have an education. Also, a cool mechanic would be having children in my colony. They could learn things faster, won't need a job until a certain age, and maybe can perform in a theater or something like that as another form of fun.
There should also be a way to see every student in every school without having to go to that school. And a way to demolish buildings faster. I was thinking something like a box that you can change the size of to get rid of many objects. There should be a similar mechanic for selling objects to. It takes way to long to get rid of objects now. There should also be some sort of way to see the stages of atmosphere in game. And there should be something besides just a tourist and colonist. There should be a inspector or something like that that will give you a boost in the number of tourists coming and how money they spend. Or lower the tourist number and the money they spend depending on what they think. I don't think it should be based off of how the colony looks though, but how well it's functioning.
Also I think how your colony looks could play a role in how happy your colonists are.