I beat this game, legit. Well, I did on an emulator but without savestates and in one sitting. It feels pretty good because when you beat the game, you would have actually mastered all of the levels to get there. I pretty much memorized the patterns of every level (You have to if you wanna get to the boss with a decent amount of health). Though this game is super hard, one thing is clear, you can't beat it on a fluke.