I’m going to be honest I didn’t read most of this but people do make browser games and they are very advanced. I work IT in a school and play the games I ban for a few minutes for uh, research, and I’ve basically played CS 1.6 in browser. I just played 1v1 fortnite clone where you could build. Check this open world need for speed knock off, even has mobile support: www.crazygames.com/game/crazy-for-speed