Well there's actually four Gulliver Boy Soundtracks currently out there. two for the games which are Imagination Science World Gulliver: Game Music (PHCL-5019) and Extra Imagination Science World Gulliver Boy: The Silver Carnival (PHCL-1003) and two that corespond to the anime Imagination Science World Gulliver Boy: Last Moments of Judo (PHCL-1004) and Imagination Science World Gulliver Boy: Legend of Gulliver (PHCL-1005). Plus there are the theme song singles Ignite! Gulliver Boy (PHDL-1026) by Kiyohiko Ozaki and Aitai Kara (PHDL-1039) by Misumi.
Incidentally, slightlydark has a copy of the Game Music album at:
http://www.slightlydark.com/album.php?album_id=d1ce44184f2f9cf17cce178e44078ae 4
Update: I have finally listened to all of the tracks from the game music soundtrack and after playing the SFC version the other day and hearing this album this morning. I don't recognize any of the tracks. Tracks 1-41 are orchestra arrangements while the other nine sound like music you'd hear on the GameBoy. So that leads me to believe that this album corresponds to both Saturn and GameBoy games. I could be wrong, so could anybody help me out?
Oh, slightydark list the composer as Kohei Tanaka, but the Yahoo Music Japan site list the composer as Jurota Kosugi.