To me it looks look a low poly apple with an A (for Asahi) on it.

I’m not sure if it’s a grand strategy game, but Freeciv is similar to older Civ games.

That being said, Beyond All Reason (BAR) and Zero-k are Total Annihilation inspired and have a lot of work put in them. Definitely worth a try!

Maybe it changed when you last looked? I set up port forwarding on Linux while using Wireguard.