According to the browser log, some classes cannot be instantiated:
"Could not produce class with ID 65.
Could not produce class with ID 81.
Could not produce class with ID 95.
Could not produce class with ID 124.
This could be caused by a class being stripped from the build even though it is needed. Try disabling 'Strip Engine Code' in Player Settings."
to know which classes are missing. Then I suggest adding a dummy scene to your project that have references to them, so they are not stripped from the build.
Alternatively, see https://docs.unity3d.com/Manual/IL2CPP-BytecodeStripping.html
for details on how to preserve classes by adding them to a link.xml file.
Thank you for submitting your support request! In the meantime I would suggest checking out http://answers.unity3d.com/
and our Forums at http://forum.unity3d.com/
for additional help.
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