tryed the default troubleshooting for every steam game, that doesn't work right away?

locate the game in your Steam library list
-> right click on the game
->Properties
->installed Files
->Verify integrity of game files
steam will check everything and re-download broken files

fixed issues in the past for me
otherwise uninstalling and re-installing might be worth a try

I have the same issues. Verified the integrity, even uninstalled and re-installed the game. Does not want to run.

rip dog. missin out on the best game ever made.