To start, to me it works perfectly in WebGL. But it is not the kind of game I would have upload to WebGL, it is clear that it is easy to not work for many people. In WebGL you're making the game working inside a web browser, so your resources are limited.
The idea is interesting but the gameplay is slow. Incredible you had created all this map. I am not sure if the assets are yours or not, but it is incredible work.
Well done