I love bullet hell games and this was a good 3d one! Short and sweet, not too hard, and a good balance between 3d and bullet hell. The main complaint I have is the camera clipping through trees, obscuring the scene when I need to dodge, and costing a life that doesn't need spent with, say, a quick x-ray post-processing.
Really interesting concept that plays with the idea of what 'bullets' represent in a bullet hell. Your only 'punishment' for getting hit is that the screen gets wiped of bullets, and it's only clear why that's a 'punishment' once you understand what your goal is. Very clever.