Airball (NES - unreleased) cover art
(Source: confirmed by the artist on Facebook)
Dragon's Fury, AKA Devil Crash MD / デビルクラッシュMD (Mega Drive - 1991)
Cover art for the US and European versions (Source: mentioned on the artist's website)
Medieval Lords: Soldier Kings of Europe (DOS, Commodore 64 - 1991)
Cover art (Source: credited on the box)
Pac-Mania (NES - 1990)
Unused cover art (Source: confirmed by the artist on Facebook)
Airball
Dragon's Fury
Medieval Lords: Soldier Kings of Europe
Pac-Mania