Sort of like Civilization, but set in space, and infinitely more complex due to total player customization. You create your alien race's governing style, society, racial advantages and disadvantages, ship design style, your minister (toggled computer control on specific units, planet,s etc) style, initial areas of technological development, and so on. You assemble your ships, small space craft, ground troops, sattelites, space stations and such from scratch using components from technology areas you've researched, choose a strategy they default to from a list, and if you learn how (I never did) you can code your own strategies for them to follow.
Your society's state of being (happiness?) is determined by a wealth of factors in the game, most of which are indirectly under your control, and their happiness impacts their productivity. You can perform intelligence operations, and sends spies to other empires to learn about them, to sabotage them and their operations, or even to help your allies. There's dozens of different types of weapons to make use of, armors and shields to defend your units, facilities to customize your planets. Late in the game, if you've researched Stellar Manipulation, you start gaining abilities to reshape the galaxy to fit your needs: Creating and destroying planets, stars, warp points, black holes, nebulae and such. You can make your race psychic and use weapons that mind control the crews of enemy ships, or take organic manipulation and build ships that heal their damage after battles like living creatures.
I've been playing for a few months and I still don't know or understand everything that the game offers. I haven't described a quarter of the game here. It's very immersive.
Also, because I feel like it: People who want to make custom racial portraits for their empires can send me image files of a member of that race, and I'll put it into the game for them.
Screen Shots!
A system!
A solar system that I share with one of my Allies, the Drushocka.
Research fields.
Many many fields of research excluded due to display constraints!
One of the two design windows.
This is a list of all the designs I've made so far that I still use.
My alliance menu!
Six members. I only have 11 votes. The Drushocka empire grows alarmingly fast...
My system's finances.
Ah, silly Phong. They give me Tariffs because I felt like asking for them.
Space Combat
Some of my short range fighters against an enemy colony ship that wandered into my territory. They are so very doomed.