Was trynna get it to work properly on my 1366x768 screen, didnt work for me but you can fullscreen it by doing the following (works for any unity game):
1. Make a shortcut of the exe launch file.
2. Open properties of the shortcut.
3. In the tab "Shortcut" in "Target" write this at the end of the file path: -screen-fullscreen 1 (fullscreen) or -screen-fullscreen 0 (windowed)
4. Launch it.