I have confirmed that all of these games provide a rom file (.gb/.gbc). Most of the games are straight from the Game boy Rom and GB studio tags, but I've filtered out those that are only playable in browser and/or aren't made for Gameboy. The rest of this collection was found by digging through various related search terms. This list does not intentionally include NSFW content or de-makes but otherwise is as comprehensive as I could make it. Please let me know if I've missed anything and enjoy!
(You can find more games/info about the indie gb dev scene at https://gbadev.org , https://incube8games.com/collections/all , and https://www.spacebot-interactive.com/ )
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