After all, despite being slowlier, this is not an excuse to get the same awfull looking graphics...
Sometimes those games are not that well "ported", yet its concept and gameplay is such that this is not That important, the game is simply too good to be wasted by such detail as the use of Mode1, and it was still sufficently sufficiently re-done.
*Head over heels : no attributes and the no-rastercolourchange policy enable to not waste CPU ressources uselessly, while the only 4 colours are cleverly choosen and used in a cartoon styled madness...