I found this clone of Civilization (the fifth release I believe?) on the F-Droid app store. I played through on the apparently pretty easy settings that were mostly default and got a science victory on my second playthrough. On my first playthrough I reached 100 turns and got a message from the developer saying something like "I'm sure by now you've noticed that the game is incomplete" and just sort of put the game aside for a week or two until I decided to try it again. Maybe the AI isn't finished as I was never attacked, or maybe it was just on that easy of a difficulty.
Overall the game played quite well. The graphics were occasionally a little difficult for me to figure out but got easier as I got more experienced. There is a lot going on!
It was fun to build out a big civilization and I could see myself doing it again in a month or two.