I decided after reading your comment to attempt to port the game to HTML5 with WebGL. The issue that I had encountered that stopped me from initially building a WebGL version was an issue with debug physics code that was not being used. I was able to, after removing this code, build a version for HTML5!
The graphics are not quite as good due to inherent limitations of the WebGL version of Panda3D, though it works! Please let me know if you have any questions!