Hello, I've just released the original source code of "Toto se promène" (a.k.a. Blupi) in the smaky-legacy repository on GitHub. This is the classic game that served as the foundation for Initmaster's new Game Boy edition.
Source code: https://github.com/blupi-games/smaky-legacy
The GB version: https://www.maniabricks.com/games/blupi-is-back/gameboy/index.html