I'm very sorry to hear about the issue! The issue you posted isn't Steam-related, as far as I know - it's complaining about a missing SDL library, and SDL is its own separate thing.
I unfortunately have no access to a Linux system I could use to debug, but https://steamcommunity.com/app/684270/discussions/0/3223871682626312293/?ctp=4#c... has discussion of an issue that looks very similar. You could try ignoring the steam-related parts of those instructions and just using the "export LD_PRELOAD" parts?
I'm also informed that the game runs well under Wine, for whatever that's worth.