I bought all blueprints, 4 ships, I founded 4 new systems and now I have..

It doesn't end. Maybe it will until you complete all the missions in every space lounge, collect all the blueprints, master all the medals to gold.

It doesn't end. It keeps going on forever..... Or at least until you get bored and delete it

You complete the story, medals, and obtain best gears and(or) buy the Kaamo club and collect all the ships in the game.

Then, at that point - You battle pirates and factions

Galaxy on fire 2 is a sand box game meaning free roam and endlessness there is no end to it people will always have more stuff for you to do the only thing you can do is achieve all gold medals in the game and all that dose is if you complete all the medals you can get gold you get the void x which is almost impossible to find I got lucky along with buying my specter (the stealth fighters) which are very hard to find. And even if you complete the supernova add-on challenges all you get is just the fireworks which are pretty cool along with that too complete most wanted and buy every ship and everything from every station but still it won't end.

Goes on forever and get all the kommo ships!!