So happy to find this as the original is one of my all time favorite games as well. If I can drop a few suggestions...
-I think it'd be nicer if the pointer didn't jump to the other side when you reach the bottom. It makes it tricky to shoot balls on the bottom on either side as I'm often accidentally shooting in the wrong direction.
-I'd make any d-pad button work for shooting. Just even more convenient.
-A high score screen with name input would be a very nice addition.