Yeah I saw the Desert Dream remake, fantastic stuff on a C64 - top notch coding, graphics and music.
You should check out one of my personal favourites Tsunami from Booze Design, if you haven't already:
http://noname.c64.org/csdb/getinternalfile.php/6135/Tsunami.zip
I love that demo cos it flows so beautifully - it's so laid back and looks so effortless that while you're watching you forget how difficult that stuff is to do on a C64...