I checked out the trial. There's some significant issues with grammar in the dialogue and some of it feels really stiff. The gameplay is fun though and the characters are interesting enough. I especially loved the menus. All of them were gorgeous. The mini-game (Hexabattle) as well. These were brilliant.
As far as charging is concerned; all of what I saw was original. As long as you haven't used anything without permission (specifically commercial-use permission) and you're not going to charge $20 or more then I see no issues.
Aveyond was terrible for a number of reasons, it was unpolished, used copyrighted material, boring as hell and unoriginal. Not to mention, expecting more than most indie developers charge for something made in a hobbyist program is ridiculous. I can go grab most indie games for under $10 and those are completely original, programmed entirely by the developers - much more work is put into them. The biggest reason that I disliked Aveyond, however, was the feeling of a mass-produced product. It didn't feel like a game.
This does.
Price it reasonably and I know at least I'd pay for it. =)