I have played "Planet Crafter" before, in early access without any issues. But now I have seen that the 1.0 is released. For some reason, after the update, I couldn't get the game to start without a crash.
After playing and testing some things, like other Proton versions, GE-Proton and much more, I was about to give up.
But for some reason, I changed and installed the dev channel (1.0.2.x), instead of the stable 1.0.1 version, the game starts up again!
So if anyone has similar issues, you should try to switch to the dev version. Maybe this solves the problem.
BTW: My startup string is gamemoderun mangohud %command%
Maybe... If I use the stable version, it works also sometimes with PROTON_USE_WINED3D=1, but has only 2fps. I can remove this parameter with the dev version and have 45fps.