Hey nice to meet another Polish dude! We use Twilio's Video SDK and their P2P rooms. This works fine for most users on desktops and good internet. When I play with friends in CA (I'm in NY), I don't experience any serious issues. Sometimes there's feedback when a user has their speakers blasting. Many of our users experience problems on mobile when there are a lot of players in the room. We're thinking about switching video providers to one with an affordable server option to improve the larger game rooms experience though.

How much do you guys spend per month on the Twilio API if you don't mind me asking? We are currently running our site on an ovh server for $5 a month with no problems since we don't have a crazy amount of users.

Haha definitely not the cheapest project I've built. Happy to share specific with you over email: mariusz at cyberspaces dot app