Really amazing visual and sound polishing! It was really satisfying to shoot the boxes.
Gameplay wise, it is mostly about the accuracy of the shots. With that in mind, I only did single bullet shots at the start, and slowly increased my pace when the boxes are stacked together(with less of a chance to hit the wall). With that, I got a score of 4642(Idk if I saw it correctly)! Because of that, I suggest that some bullet that hit the box still bounces back---giving a really big but interesting challenge.
Great job!