Difficult.
I stopped trying after working on the square one a bit. It's pretty hard, and takes a lot of thinking. I really liked it. The gameplay was good, and there didn't seem to be any glitches when I played it. I would suggest looking into how to make it so that players can't right click and cheat. But other than that, the music was nice, the graphics were simple but good, and... well... what else can I say? Great job, Benjaminsen. Keep up the good work.