Gaia Master Duel: Card Attackers (Capcom, 2001)
Much as it sounds like a 1v1 card game, it's actually a 1v1 roll and move game where you can play cards to get special abilities and impact the board. Seemed like it could actually be pretty interesting, but there was about three novels worth of narration at the start, and I didn't have time to even attempt to translate all that.
Gakkyuu Ou Yamazaki (Koei, 1999)
Seemed like some kind of simple life sim game. It also had a crapton of exposition, and the character design is just awful.
Galaga: Destination Earth (Pipe Dream Interactive/Hasbro, 2000)
Every classic arcade game had to get a GBC remake, and Galaga was no exception. this is really just the same game with a scrolling background and a camera that follows you a little if you go left or right. I prefer the original having a black background and keeping the camera still, honestly.
Game & Watch Gallery 2 (TOSE/Nintendo, 1998)
I assume the first game released on the original GB, but the 2 in the NA and EU releases is at least much less confusing than in Australia, where it was Game Boy Gallery 3. It seems like it's just a collection of five colorized G&W games.
Game & Watch Gallery 3 (TOSE/Nintendo, 1999)
This came out in Japan in 1994 as Game Boy Gallery 3, but then released in Australia as Game Boy Gallery 4. Who would've thought assigning a name and number to some old G&W games would be so hard? Someone get Phil Collins in here, he's good at that stuff.
Game Boy Wars 2 (Hudson, 1998)
Certainly feels and looks like an early version of Advance Wars even though it's by the wrong dev. You buy units with points from your factories (the pointy buildings) and then move them towards the bad guys. That triggers an animation where they shoot at each other and their numbers go down. There's really no reason to play it now that AW exists for real, but it's cool to see.
Game Boy Wars 3 (Hudson, 2001)
Pretty much the same game, but with much better graphics and a full campaign with beginner/tutorial missions.
Game Conveni 21 (Starfish, 2000)
One of those "many games in one!" things, this time with presumably 21 games. I didn't count them, but I did scroll through to see that they're all pretty much variations on simple puzzles or classic public domain games. Par for the course with these, really.
Ganbare Goemon: Mononoke Douchuu Tobidase Nabe-Bugyou! (Konami, 1999)
This series showed up in NA a couple times, usually as some variation on Mystical Ninja. This particular title ditches the usual action format for a 1v1 turn based RPG that lets you catch and train monsters to fight for you. Wonder where they got that idea. You could also transfer monsters to and from Goemon Mononoke Sugoroku on N64, which is pretty cool.
Ganbare Goemon: Seikuushi Dynamites Arawaru!! (Konami, 2000)
Back to action games. It's a character platformer that's unique in having equippable weapons and two playable characters with their own stories. The early level design seemed decent, and I like that you have health bars instead of binary pips so that enemies can deal a range of damage.