Hrm it looks like something to do with Gtk (The UI system Linux uses) or the theme it uses:

/usr/share/themes/Mint-Y/gtk-2.0/main.rc:1084: error: unexpected identifier `direction', expected character `}'

A quick google shows that it is a fairly common issue with Steam games. I can only assume that your UI theme doesn't work with the 3D engine we're using (Unity3D) for the specific version we're on. By chance, we're actually going to be pushing out a hotfix with a new version of Unity3D in a few days. So you could wait for that, or look into the above error and your theming system in the meantime.

Let me know how you get on, and I'll let our Community Manager know of this thread and to get in touch with you when we push the hotfix live.

Can you please provide the Player.log for review?

It is highly likely due to bad GPU drivers in Linux. Ensure you've got the most up to date drivers. You may need to do some research into which drivers work best for your configuration due to how fragmented Linux is with GPU drivers.

Awesome! Our apologies it took so long to get this patch out. Hope you enjoy the game. :)

Hey guys, we just released patch v1.4.2 on steam! Please verify cache and let us know if the OSX crashes still persist for you.

That sounds like continued UI issues unfortunately Kamil! :(

I'm so sorry you're continuing to have issues here. I'll contact John myself now and see if we can't sort this out ASAP.

Good news! We believe we've found the bug and will endevour to push out the fix this week. We'll keep you posted.

Do you have any other anti-virus applications running?

Can you confirm for me you're using the latest drivers for Intel GPUs as per here: https://01.org/linuxgraphics/downloads

Can you please provide your Player.log for this session?