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I have sent you the log file. 

It says "WARNING: Shader Unsupported: " and  "ERROR: Shader Shader is not supported on this GPU"

So it is actually about pixel/vertex shader versions.

Thanks! Yeah... It must be GPU related, unfortunately. I had no idea. I will try to get a clarification from Unity. Sorry :(

No need to be sorry man. I am a programmer as well and I know how this sort of small things pop up from time to time. Your game looks, plays and sounds awesome, I wish you the best of luck with the development, cheers!