When the game went from 1 alien to many aliens was when it outstayed it's welcome for me.
Most everything else was paced well enough and fun but by then it was too long and the last portion of the game after that was more about having enough flamethrower ammunition to keep the aliens at bay as your sprinted
That turtles game wasnt even that fun there were better turtles games to play on the nes and snes
Battletoads on the other hand was quite fun but then that jump on the speeder level always made it near impossible. So you were always discouraged that you would get stuck on that level. Or like one time I made the jump but then had to go and my parents turned it off...like battletoads was not that difficult if you made that jump but man was it hard to.