A tower defence game where everyone shares one galaxy
The black hole swallows this galaxy in …
A record stands until somebody beats it, in any galaxy.
Every empire gets one transmission every six hours, and the best ones make the news. Pick a name and yours is ready.
PlayA tower defence game that keeps going when you close the tab.
I'm making StarTurrets by myself. You get a small world in a galaxy that everyone shares, put towers on the roads into it, and hold it against pirates and the other empires.

Your towers hold the roads into your world. While you're away the raids keep coming, and when you get back the game tells you what your base earned and who came for it.

Every planet, moon and asteroid on the map can be taken. What your base produces is sold at the trading post in its system, and the coins go into more towers.

When you want a bigger world, you invade someone else's. You choose the troops, which road each squad takes and which towers the air strikes hit. The owner gets ten minutes of warning, and they're planning the same for you.
A black hole in the middle swallows the galaxy at the end of the season. Whoever is richest when it does wins, and the next galaxy is named after them. Pacts are signed and broken on the way, and the news reports who betrayed whom.