Only issue has been one that I have with a lot of Unity-based games, owing to my dual-monitor desktop. It happens the first time I open almost any Unity-based game, and I don't blame the game for it, it's a known Unity issue.
When I first launch a Unity-powered game, it defaults to going full-screen using the entire "available resolution" across both monitors. The only way to fix it is to kill the game after it's opened, and then go to the Unity directory under ~/.config. Under there you find directories for every Unity game you've run, and under each one is a config file controlling how Unity displays that game. Just change the fullscreen option to 0 and then the resolution numbers to anything smaller than the resolution of one monitor. Once that's done, I can open the game successfully.
I'm at work just now, so I don't have the config file to paste (so I can show you what it looks like).