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Here's a guide which helps select tools for Game Boy homebrew development based on skill, experience and project scope:

https://gbdev.io/guides/tools.html

There was a big Game Boy homebrew jam / compo in 2021 with more than a 100 entries. A bunch of them are well polished and have solid gameplay :

https://itch.io/jam/gbcompo21/entries

https://gbdev.io/gbcompo21.html

A lot can be found on itch.io using the "gameboy-rom" tag: https://itch.io/games/tag-gameboy-rom

GBStudio has really changed the landscape and brought a lot of people into homebrew development who might otherwise have not joined for lack of programming and tooling experience. In addition to that, there are also a good number of non-GBStudio releases happening (ASM, GBDK-2020, ZGB engine).