I think this is a really cool concept! I had a little bit of trouble telling what the pieces were when they were lined up vertically (on the second? third? level, with the knights against the king and bishop, it wasn't easy to tell what the bishop was, because it kind of blended into the king).
I can imagine various small quality of life improvements (an undo key; maybe something that highlights the attacking piece if you try to move into check...), depending on where you want to take it. I hope it does get attention!