I'm not experiencing any of those problems- maybe it's a connection issue on your end?
Neither am I, it ran smoothly on my part.
@DayDun, which version did you run? PC or Mac?
This game is rather simple in terms of CPU usage, and it runs in 60 fps. Should run silky smooth. :D
It usually occurs the other way around. Windowed mode tends to slow down games.
Nevertheless, happy you were able to resolve the situation.
I don't have any of these problems, completed the game fine. It must be your computer?