System Information:
CPU: Intel(R) Core(TM) i7-4765T RAM: 16G SSD: KINGSTON SUV300S37A120G
Video: NVIDIA GeForce GTX 960 4G (nvidia-current 396.54)
OS: MagOS Linux 2016.64
DE: Plasma+compiz-fusion 1680x1050
Proton version: 3.7-8

I confirm:

• game works very well without any issues after executing a command:
  protontricks 408920 vd=1680x1050 windowmanagerdecorated=n windowmanagermanaged=n
• without this command game is unworkable, it freezes on black screen when starting unity intro or after it

I'm wondering why proton doesn't use these settings on default, this fixes all my problems in most of games I had played with proton.