I have this game too and enjoyed it for the SNES. The Super Famicon version was called Jerry Boy and I have that too and have played it. It is interesting that the Japan Super Famicom version has dialog between the levels that was omitted in the U.S. SNES version. I couldn't get too far in this game until the Game Genie for SNES was released and I used some codes for the game that made tha game easy to finish.
If you want to chat with me about SNES RPG'S my aol screename is jazzgirl1920s. My e-mail address is email@example.com