[marlz]

I didn't manage to get further than the 3rd screen of the Stockyards in the Abe's Oddysee demo because A RED SOUL RING CAME OUT OF A LAND MINE AND BLEW ME UP! I'm serious... I red soul ring (the red energy ring which blows stuff up) came out of a land mine and exploded everything on the screen.

So I don't think you could get any further than there with out a cheat.
And you probably can't rescue all the Mudokons because some secret passages are missing in the demo... I think.