Add on to my last comment about the boss difficulty being too high: The denser patterns on the final boss aren't humanly possibly. I think you might have been trying too hard...
For the actual game, the stages are a bit too easy for a "bullet hell," while the bosses are done better but lean on cheap. Homing missiles with extra long targeting? When my screen is filled with shots? Overall fun, but the difficulty jumps too much from stages to the boss fights. At least we have regenerating health and 10 lives to balance it out.
Et3rnalLegend64's comments