I got it working after several tries on Linuxmint 64-bit with Nvidia and bumblebee.
I made a fresh install with of wine 1.7.28 and ran
winetricks steam
to install steam. I chnged the start command to use optirun and all is working as it should.
The only problem I have that the program crashes quite often when I try to save the game.
Grimrock 2 is really awesome. I'm wating for the Linux version
