One galaxy, shared with everyone who plays. Ports run low when people buy from them. You can run into other traders, and they can shoot you.
There are no accounts. This browser keeps a secret key that is you. Once you're in, Other device gives you a link and a QR code to open the same trader on your phone or another browser. New traders can't be attacked for a few hours.
Friends and strangers share this. Don't use a name or message you wouldn't say out loud.
Scan this with the camera on your phone, or send yourself the link. That device becomes this trader. Both keep working.
Anyone who has this link is this trader: they can spend the credits and fight with the fighters. Keep it private. Save it somewhere (notes, a message to yourself) and you can get back in even if you lose this browser.