This sounds VERRY familiare. Played something that sounds like this on the family Mac SE in the late 80's.
You had an inventory, could collect gold, food and other things.
Each "level" had a key hidden, you needed to get to the next, and if you encounterd the mummy, you where as good as dead.
You could throw nets over the lions and snakes. Some traps where visible, and you could release them by using a stick (if you had one). Usualy it was a spear-trap, but there where also wind-traps, that would make your lantern go out, and waste oil.
bbl when i've found some screenshots.
EDIT:
oook.. Seems the game was called Scarab of Ra
http://www.semicolon.com/Scarab.html
