An angled disc-bullseye exploding into pieces? The actual depiction won't be as important as the graphical touches. Right now, your non-3D graphics are a little amateur.
Also, can you make the balls a little more spherical? They're the main focus of the game and the background kind of overshadows them.
Actually, why are they spheres and not discs? Discs would look better (more traditional) and add difficulty when they rotate.
Or even better, use spheres on some levels and discs on others (where it makes sense.) definitely crank up the poly count on the spheres and anything else.
Here's a free idea. Let the user use any photo as the texture for the targets. User just got dumped? Let him select a photo of his ex from his photo library and blow her visage to smithereens!
Also, can you make the balls a little more spherical? They're the main focus of the game and the background kind of overshadows them.
Actually, why are they spheres and not discs? Discs would look better (more traditional) and add difficulty when they rotate.