This game is fun to play, but sadly, it crashes.

In Chapter three, on the Nature floor, there is a place where you need to remove three sticks that have jammed the mail tubes. Following that, is a cutscene showing the mailroom in another part of the house.

At the cutscene, the game quits to desktop, and upon restarting, goes to the cutscene and quits.

I hope this bit of information helps the developers define the problem and publish a patch. Too bad the beta testers didn't find it.