Thank you for your offer, and sorry for the late answer.
Unfortunately I can’t give the source code to other people and even while compiling a Debug-exe file I don’t find the reason why it’s not working on mobile GPUs or integrated GPUs. The Godot Debug Console stays empty.
As soon I sold enough copies to buy a system with an APU, I will buy it and try to find the error. But, before that I need to sell a lot more copies ^^