This shows some of the practice that went into getting the final level down and beating the game legit. No commentary really needed, I can explain below. I only posted this practice session since it is the hardest part of the game.
First I practiced the area right before the final boss with the flies and the final boss together, to make sure I had it down decently. Then I practiced beating the final boss with the bombs I had. However I would only have those bombs if I got to the final boss without dying on the level at all. So after beating the boss several times with using the bombs (the bombs only clear projectiles, they dont hurt the boss), I practiced without bombs. After beating him a few times without the bombs I finished off by going back to the previous checkpoint (where you go if you die at the boss) with no power ups. I got through that and beat the boss and that concluded my practice at the time.
Now I will try to beat it legit. I practiced the level itself some more too but I thought some might find the process of using save and load states to put games together interesting.
I will have the full run up with commentary after I beat this level. Should be shortly. I will explain everything I was doing in full detail in the tutorial video. This is just a little behind the scenes.