You'll want to report this to the developers also.
I've reported it to the game developers on both their forums and through their zendesk ticketing system and have received only a canned response through their ticketing system telling me to verify my steam cache and to report it on the forums.
Hello @bluescarni, @h0ser81, are either of you still experiencing this issue on an up to date system?
It looks like the b.fd.o report fell into limbo.
Sorry haven't played the game since. I can try to re-install it over the weekend.
Closing pending feedback.
Nothing extracted yet.
The game lockups either on startup or when loading a level. Full details are available here:
https://bugs.freedesktop.org/show_bug.cgi?id=92428
Both reporters are using the radeonsi open-source radeon driver.