Mr Red's adventure in The Missing Balls is a fun and hard platformer where you play as the red hand puppet Mr Red and try collecting the 24 lost balls scattered through 14 levels of christmas joy and evil gnomes. And it has a final evil boss that holds the last ball of them all... Warning! This game is PERMADEATH! So beware! And it will be free, since it's christmas.
Tested with Ubuntu! Sometimes you need to right-click the tar.gz and allow it to run as an executable to get it working.