Before landing on a full-time sound designer position at Nokia in 2002, I did a few game soundtracks and sound effect jobs on freelance basis:
Elfmania (1993) [Amiga]
Project S-11 (2000) [Game Boy Color] with Jonne Valtonen
Tom & Jerry Mousehunt (2001) [Game Boy Color]
+ one cancelled Game Boy Color title in 2001
I also have additional music credits in a couple of games, typically one track per game:
Kumoon (2015) [PC/Mac]
One Infinite Loop (2011) [iOS]
Hardcore Pinball (2003) [Game Boy Advance]
Mean Mr. Mustard (2001) [Game Boy Color]
Smarty and the Nasty Gluttons (1994) [Amiga]
I'd love to make more game sounds!
My Game Boy music routine Carillon Player was used by other composers in Hugo Black Diamond Fever (2003) by ITE Media (composer: David Filskov), and also in 3 unlicensed cartridges published by a subsidiary of Datel Electronics.