I anticipate this will break because it doesn't have any load-balancing, but this is a game I made several years ago with WebGL, hosted on Heroku. The original source code is available but needs to be updated to use the latest version of Socket.IO as it is here.
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[ 1.5 ms ] story [ 17.7 ms ] threadhttps://github.com/teamduck/gametube/tree/master/tanks
The game uses arrow keys and spacebar for controls. The Konami code unlocks something cool as well.