Thanks to your help I was finally able to finish the game!!!
https://factorio.com/galaxy/Quantum%20I ... ta6-2.D5U4

Thank you so much!

In order to avoid running into a save corruption, I have used two different manual saves and three autosaves.
But it seems, that all of them got corrupted this night (level.dat is missing, different ones in each save).
Can they be salvaged?

I have also tried restoring the saves from the steam ...