This piece of code is so nice that it would be a crime not to share this information to you :-).
http://www.logicielsmoto.com/phpBB/viewtopic.php?p=5382#p5382
Thomson To8 is a french computer that was sold in 1986. Some of its graphic modes are similar to our good old CPC, with more colours.
A CPC Plus port of Liftoff would be a nice project :-).
Very nice prod and impressive intro & sound. :o