Necrophage as an Origin isn't the best, but it is very thematic; rather than expand via colony ships, you can invade primitives and conquer them with armies and convert their pops into your own. Also, you get portraits, of course.

If you actually want to work alongside other species instead of bulldozing them, this adds a lot of nuance to the Federation system.

Concrete jungles have an appeal all their own, but being able to really bring some life to the green spaces in a city is far more rewarding.

One of the more vital DLC for Cities, giving you a plethora of public transport options.

There's a few bugs at present; combat computers for ships, particularly the aggressive ones, are not properly buffing the ship they're equipped on, and one particular end-game crisis has a sound effect that likes to loop indefinitely.

However, these are only two glaring bugs that remain, as a number of others have been patched. Now the game is a rather nice bundle of fun, though it is a bit lacking in some areas - these will likely be fleshed out with DLC.