>>725315995
2 gets dragged once you hit the last few harder levels that focus more on platforming than speed, but that's not the bad kind of drag, it just means the game is now difficult so you can't mindlessly race around. Scrap Brain was better than Metropolis though, Metropolis is more annoying than difficult.
3&K gets dragged because the last levels have zero challenge whatsoever and it becomes a "hold direction to win" game. Even Death Egg is just long long paths of running with minimal challenge between (it even has autoscroller parts!!), maybe the sub-boss is the only one which is actually difficult.