This one was really satisfying. At first I was pretty confused, but I slowly got the gist of it. I was still a little unsure of certain things - like I didn't know how to build my own UFOs if I set auto-build to off. I also didn't really understand why human cities kept re-building. Do they always rebuild a certain number of times? Is it random? That wasn't super clear right off the bat. At first, it made me think I hadn't successfully destroyed the city and needed to do something different. It was on my second play through that I realized that I guess they just eventually stop getting rebuilt.
The UI was also kind of confusing - I could click cities to see the "mine" and "attack" option - but first thing is, I didn't understand if I was actually clicking/selecting the human city, or the UFO that was on it. The second was that if I set it to either of those I didn't understand which UFO was going to be doing the action. I don't know, like I said it was confusing. It also took me a while to figure out what was happening with the ships. When I first started getting attacked, I thought my ships were the ones attacking. I think just more clarity on what's going on would be super helpful.
Eventually I did manage to win - I mostly understood it by instead just clicking the mothership and selecting all my UFOs to either attack or mine when they spawn (at least, I think that's what was happening?). Getting stronger and buying things in the shop felt very addicting, and I really liked the exponentially increasing aspect to it. Cool game!