@Nenad A.
i have a bug, thats really annoying :/
i play the game, then i alt+shift to the desktop to get something without closing the game. but then, its impossible to go back into the game... when i try to re-open it switching or else, it just show an small black squarre at top left of my screen and the game screen didnt show anymore.
i tryed multiples times, but still same problem. impossible to go back into the game, soo i lost my progression :/
i dont know if someone else also have this problem, but i hope you can fix that.