I know I can upload different downloadable versions of the game. But I also want to make different web versions playable cause they gain more plays in my case. Is this possible? Something like stable and beta/experimental branch in some steam games.

At the moment we don’t support having multiple HTML5 builds of a game active at the same time on the same page. It is something we would like to add in the future though!

For the time being, you would need to create a separate page