I made myself a romhack of this game that changes the point at which the screen scrolls so that you have a bit more time to see enemies coming, plus changed the placement of a few annoying enemies that were too close to the player when entering a screen (plus made that pizza reachable, you know the one). I didn't a touch thing for the sewer level, there is nothing wrong with it that truly matters.

btw I never released and I won't, it's just for my personal pleasure