Blaster Master (NES, 1988)
Exile (Electron, 1988/AMI/ST/C64, 1991)(Superior Software/Audiogenic version)
SpellCaster (SMS, 1988)
The Battle of Olympus (NES, 1988/GB, 1993)
Cyborg Hunter (SMS, 1988)
Draconus (C64/Spectrum, 1988)
Captain Comic: The Adventure (PC, 1988/NES, 1989)

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Treasure Island Dizzy (AMI/Multi, 1988) 
Death Stalker (Amstrad CPC, 1988) 
Impossible Mission II (Multi, 1988)?
Spycat (BBC Micro, 1988)
Predator (MSX ver., 1988) 
XZR: Hakai no Gouzou (PC-88/PC-98/X1/MSX, 1988)(Untranslated)
XZR II: Toki no Hazama ni (PC-88/PC-98/MSX, 1988?)
Matou no Houkai: The Hero of Babel (FDS)(Untranslated) 
Tritorn II: Road of Darkness (PC-88, 1988/PC-98/X1/MSX, 1989)

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Outliers:

Kenseiden (SMS, 1988)

Bionic Commando (NES, 1988)

Lord of the Sword (SMS, 1988) 

Cosmo Police Galivan (NES, 1988)

Rex (ZX Spectrum, 1988)
Super Mario Bros. 3 (NES/SNES) - Proto-PA
The Scheme (PC-88, 1988)
Samurai Warrior: Usagi Yojimbo (C64/Spectrum/Amstrad) 
Dark Side (AMI/ST/C64 etc., 1988)
​​Malaya no Hihou (Malaya's Treasure) (MSX) 
Star Cruiser (PC-88/PC-98/X1, 1988/X68K, 1989/MD, 1990) 
King's Valley II (MSX, 1988) 
Quest (BBC Micro)? - Find
Spooksville (BBC Micro)? - Find
Rocket Ranger (AMI/PC, 1988)