That was brilliant ! That green diamond got me all the way the first time I reached it... but not the second time, I may enter now :)
That seem like a lot of rules, with priorities and so on, really impressive in such a short time. Among the few things that bothered me: That 4 looks like a 9 because of the top right pixel (which simply shouldn't be there ?), it was pretty hard to find the rule when I was reading a 9, but then it made sense. Also a bit more contrast on the second type of arrow could be nice, it's hard to distinguish on bad monitors. And some comments are great but some are a bit too harsh on the player, it makes them face their own stupidity for not understanding the rules soon enough, which is pretty unpleasant and can be frustrating. It fits the background idea but can make people stop to play sooner than they would have otherwise..
Other than that it is really an impressive game !