Petris is a puzzle game of shapely pets for the Game Boy Color (not compatible with original/pocket). Build your favorite pets in all shapes and sizes, keep ahead of dropping pieces and make it to the next level! The game is playable online and available through Catskull Electronics as a 32K ROM cartridge. It was built using GBDK and a handful of other tools.

https://pdroms.de/nintendo-gameboy-gb-gameboycolor-gbc/petris-commercial-game-boy-color-game