Sorry for disrupting the discussion, but I want to share my findings. I assume that most of you played Commander Keen (episode 5) before - there's an enemy very similliar to JJ1 Sparks. Maybe their moves are different, but the idea is similliar - floating eyeballs surrounded by electricity.

Also, in the first Rayman game there are platforms very similliar to the fruit platform from JJ2 (graphically). I'll throw some screenshots if I find/do any, 'cause I'm busy right now.