The first one is supposedly the level of SNES or Genesis:
[link removed, video was dumb, sorry]
The second one is supposedly the level of NES or Atari ST:
[link removed]
of course I know these old systems could never handle the polygons, animation, sounds, etc, but this was just for fun to see the "stylized" graphics

(I was inspired to do these videos after seeing Sol_HSA's oldskool thread)
(the original video is by acare84)