Good for you. Most of the time, a post like yours would get a few replies, either with comments, or suggestions.
Your game does look interesting, although a couple of the tiles look strange to me, like the green dragon and the

.
Don't see the honba count or the riichi bank on the screen but at least it has a tile counter, which is something the flash game doesn't have.
I almost downloaded it, but changed my mind at the last moment. Are you still working on it?
Not quite sure what you mean by " having the AI score the possible discards". (Oh, I see, having the AI analyze the scoring and best discards)
I briefly read your rules and will point out two things.
1) there are restrictions to the pair in pinfu that you did not mention. (no dragons or value winds)
2) furiten is not just discarding a tile that you can win off, it is discarding any tile that could complete your hand. (even if you can't win off it)
viewtopic.php?f=5&t=51553&start=15#p57101
Also noticed 2 typos. toi-toi, all hands ARE sets, and strategy line 5, you can WIN with.
Don't know how much experience you have (and it doesn't matter) but you should try posting your opinions to the WWYD's in addition to just reading them. I ask lots of questions and we have a pretty friendly group here. Of course there are 1 or 2 who occasionally but infrequently.....................................