An interesting idea, but unfortunately the execution didn't quite make it through. I found myself completely guessing whether it was the correct target, because the instructions were vague and the attacks were not varied enough to figure out the puzzle without trial and error.
The concept of a puzzle/bullet hell is an interesting one, but I'm not convinced it worked here. Maybe if the puzzle elements were more exaggerated and the instructions made clearer, then it might show a better example of what you're going for.