Did my own testing. My specs.

What works:

• Sound/Music settings
• In-game store menu
• Assigning keybindings
• Alt-tabbing
• Fullscreen/Windowed
• Different resolutions
• Collections menu
• Quitting
• Steam overlay
• Tutorial
• Normal games

What doesn't work:

• Changing back to my original resolution (2560x1080), but
  it's a game bug according to this forum post. Solution is to use regedit for fixing it.
• I think the game doesn't support ultra-wide screens even though it works the first time. Many things are misplaced in the game at 21:9 resolution. After setting it to 1920x1080 there is no way to return to 2560x1080. So it looks like a game bug to me.

What I didn't test:

• Linking a device

Conclusions:

• Game is a definitive whitelist candidate

More on the issue stated above.

I think it's an Unity bug since the same happens in the Unity game 80 Days. I'm able to achieve 2560x1080 but the drop down menu of resolutions will never show it as a choice.