There's a funny bug in level 11. While in invulnerable mode, jump off the ship into the water, and head left. Eventually, graphics corruption occurs and a short time later, you'll lose a life. The game will then begin scrolling infinitely, searching for the save point at which to resume.
High score list
The initial 10 names on the high-score table are written so as to spell out “Fatman eats more food in one day than you do in 6 months”. Presumably his weight problem isn’t glandular then.
Some of the levels have one required item more than needed. It seems likely that someone miscounted. Add