Ok, but then you should take care to make it look different. Having the keys laid out like a piano keyboard but playing the wrong notes would just be ... wrong.
I wondered about that as well, but humans really like music. They will play the same tunes regularly for years on end, because they love them so much. It wouldn't surprise me if the change in use is permanent.
Personally I'd like to hear some video game-style level up music whenever I climb to the top.