You probably did it to try Go, wasm and ECS and I understand that, but if you to make a game seriously, you should have stopped much earlier. In the early stage of the game development you should made 5-10 prototypes using different tech/frameworks and use the best one. I seriously don't see Go+wasm+ESC being the best one for this kind of game.
How can you not go insane if you have to wait 20s for every page refresh.