I downloaded the game and the bgb emulator and it ran fine in Windows.
I enjoyed the play through even it its not much of a challenge, as the little pieces of information from each knight were fun to read (and I got to go to Ireland twice - I'm Irish LOL). It told me I don't know the Arthur legend that well actually!
And you rounded it off with a good twist at the end.
The graphics were well done and consistent but the music became annoying pretty quickly. I imagine a lot of Gameboy games are like that :).
I reckon this could be enjoyable for very young players although you might need to censor it first.
Oh and there is one spelling mistake, but I can't remember what it is so now you have your own grail quest to go find it!! :)