nesdev.org

Henry Hatsworth is just two completely separate games, both implemented extremely poorly, mashed into one. I like the idea, but I would probably have preferred just one of the two games done right.

Maybe another way to look at it is what gives the game difficulty.

So Contra you basically die from a bullet or from falling done some stupid pit, which makes it 50/50
Mega man you basically die from some platform disappearing from you or some enemy you can't kill on a platform
Metal Slug bullet to the head
Mario because you hit a thing, missed a jump, fell down a pit, platformer