With 29 hours in, I have to say the feature(s) I like best are the colonization-related ones. Once you get to the point a world can be colonized, you decide if the first outpost will be military, scientific, or commercial in nature. Each has advantages and trade offs to the overall effort throughout the system.
Outposts get established with a viability rating based on what you did prior. You can then come back later and improve the colony chances of survival/flourishing by marking locations on the planet for mining, for forward posts, eliminating or reducing hostile threat, and by some side quests on that world and on The Nexus.
Additionally, based on points your actions earn, you decide the type and order of colonists thawing out from cryosleep. It's a gamble, because whatever groups you leave in sleep mode slows efforts in appropriate areas in Andromeda.
Overall, it has grabbed me and I'm having fun!