The special ending for saving all the three hundred mudokons is a little bit diferent from the good ending if you save at least half of them. But it doesn't mean there's no more mudokons to be saved. Actually, in Much's Oddysee, the next Oddworld game, Abe will have to save another hundreds of brothers from Glukkons facilities, and his last task will be to rescue a special mudokon, HIS OWN MOTHER!!!
In time, the muds in the cage are still there, even if you save 300
