The game is totally unplayable on my Kubuntu, while hardware requirements are met.
Few months ago I kept getting stuck in menu with no visible cursor. Peace and quiet, no annihilation at all. Today I gave the game the second chance -- well, the cursor is there this time, but there is no menu! Two minutes later some laggy music begins to play. It takes several alt+tabs back and forth to finally see "Connecting to PlayFab" message with a menu I cannot use because of said message in the foreground. Then nothing happens, escape doesn't work, again peace and quiet. It would be like Zen, except it's not, because I'm getting angry with this.
I never got to actual gameplay. Maybe the game isn't bad on Windows, I don't care. From me -- no cigar.