This was my design page for Jumpster and you'll see I was getting ambitious with adding new enemies. The problem was that I thought it was too similar to Jawbreaker II so I changed it to be simpler.
It also looks like I was planning on using Graphics Magician for the animation back then. But I didn't - it's all my own code and none of Mark Pelczarski's! Evidently, this made Mark resort to teaching college many years later.