Why the hell do you have "Exit" button on score popup?! It's on the place where "continue" button always lies. I accidentally pressed Exit both times. After Floodplains it exited to Windows and I've lost my progress. Game wrote "mountain unlocked", but mountain is not clickable.
Sorry to sound negative. I Love the game, but this thing is super frustrating. Is there a cheat code or save file to not replay Floodplains again?