Managed to get Citadelum to run on Linux.
Can't get further than the splash screen because mouse clicks aren't recognised.
Discussion
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@matt
https://www.protondb.com/app/2603020
Might be able to work around that too somehow.
At least it seems to have worked on other peoples machines 
@4fd485 Thought I found a solution to the problem online but just found my own post.
