Oh, I've played it, yes. I liked it, actually! The tree tiles bugged me a bit, but that's just me. The sprites (ie, the Green and Oak ones) are good. They're actually suited to the RSE style, you adapted them well. It was a short sample, so that's as much as I can say, but so far so good.
And I like your plan for the Frontier- kind of like what HGSS did with Platinum's Frontier, in a way?
If you keep having trouble with feedback, ask me, I'll keep playing. I played the Fire Red hack you posted, too. I didn't get to finish it, but it was also good.