About
Duck Marines is a remake of Sonic Team's ChuChu Rocket! for the Sega Dreamcast — the readme calls the original 'an amazing party game' that few people can still play since few own a Dreamcast. Duck Marines (working title) is a cross-platform, free-software remake of ChuChu Rocket! for Linux, Windows and OS X, aiming to recreate the original's multiplayer on PC.
How it differs from the original
The readme states the project uses entirely new assets (sprites, music, etc.) and includes gameplay changes the developers considered appropriate, while still trying to stay true to the original.