This is just a game play video of Halo on game boy color. You can find it on the itch store. Its homebrew, but cool nonetheless. Something I want to learn more about doing. I believe it was made with GB Studio sdk.
P.S.
Look under Retroarch options if using an emulator, to emulate the game boy SP screen using vba-m and the dot-shader effect under GLSL shaders.
If you have any questions, let me know.