I've played Saya quite a bit!
In fact, I've "played" it so much that I could basically document Nitro+'s scripting format at this point (
well, I kinda did), because I had to totally rewrite the scripting progression. You see, the original game just uses one giant script file - this causes it to have severe loading issues when translated into English, because the engine takes longer to parse it or something. Anyway, I had to figure out how to split it into a bunch of different files and get them to load sequentially and all that. Some fun (read: tedious) stuff, I assure you.
And that was after I already proofread the entire game as it was being translated.
So yeah go play Saya; Makoto did an excellent job translating it, and many other people, myself included, worked quite hard on it as well.
I'd also appreciate it if everyone would play
ef, because I slaved over those scripts too - I edited all of the actual games you see on that page. I think the Chihiro demo is a really polished piece of work, personally.