Updated on issues 2/9/2014
So the game used to run like crap and crash on Intel HD 4000 and devs did absolutely nothing about it. With Windows 8.1 HD 4000 received new drivers from Intel and the game does now run smoothly and do not crash. Don't tell me it was driver's fault because I run much more demanding games and they had no problem before on old driver. Devs never bothered to test HD 4000 and probably did not handle some valid error case. Intel masked it for them.
So now I'm playing happily for few hours until my saves got corrupted and I got kicked back to the beginning "daddy, daddy don't kill me". Integrity check does not help. This problem was known from beginning and people did recommend doing save backups but screw that. Devs still did not do anything about that for months since release.
Screw this, bugs happen but devs clearly do not care after you paid. Be aware of those risks if you decide to purchase and play.