SNES game "Zombies ate my neighbors" (lucasarts as well) also used a bonus level named and inspired after the game (...or was it the other way around?). You fight these little tentacle creatures just like the ones in this game.
Just a little fact I thought I'd share. I can (sort of) help anyone with the game get to the bonus level.
Electra: "Let's go...together"
Vincent: "When I was with you, it was the only time I felt real"