I really think you'd have better feedback from /v/, not to mention this is more of an /ideaguy/ subject.
I have some ideas for rpg's, but I'm jelly about them and won't share if my name's not in the credits.
>arpg
>a
The runny, clicky, top-down type with no active pause? IMO that is a very constrained sub-genre, since you need to reconcile the perspective (so dimensions in which you interact with the world are also restricted), the tempo and having simple enough controls to use while dodging and what not.
I'd try to develop a basis for very readable AoE effects (like the world being a chessboard and some spells only smashing into squares of a certain color, others repainting the squares and so on) and put a lot of emphasis on timing. arpg strikes me as a mastery-heavy experience, so you should make that aspect as deep as you can.
What engine do you use?