JudasIscariot: What version of the libc6 library do you have on your system, if you don't mind my asking? From the looks of the error message you may be running an older version of the libc6 library while the game was compiled against a newer one...
$ /lib/x86_64-linux-gnu/libc.so.6
GNU C Library (Ubuntu GLIBC 2.23-0ubuntu11) stable release version 2.23, by Roland McGrath et al.
I realize that my version is lower. Mint doesn't give me newer updates for these libraries.
That's why I would expect the game to ship with it like it did before (even though that gave other/similar problems). They 'solved' the issue by removing their version of the file from their libs folder, but in my case, that only makes it worse.
I've never distributed closed software on Linux before, so I don't know what is the best practice in packaging it, but my other games seem to do it fine.
Maybe the devs could also look into supporting lower versions of libc? It can't be that necessary to really need 2.25 for this game, right?