Lots of comments already mention the circle around the wall strat to just perma dodge all enemy shots---so I have a different thing: the difficulty increase. From a shotgun, three shot, lots of bullets to the single shot thing. I think better to make the enemy just have more life, and let you shoot a lot then one bullet. That's just me. I like to spray, it feels more fun than sniping in a bullet hell. So the outcome should be the same with the enemies just having more life, but we get to feeeeeeeeeeel like we are doing more than just missing our once every three second single shot sniper. Good job and keep up the good work =)