Well, we kind of are - we are uploading the music separately from the rest of the game. At some point we might upload groups of songs, since they will probably get to be too big. Right now the game without music is 83.4 MB zipped, and the music is 156 MB zipped.
Okay, the demo itself is up! http://www.mediafire.com/?y4yyozlfgbj
However, the music is still uploading, and it isn't going too well. So, here's what you can do. You can take the music from 0.3 and paste it in the new game's music folder. However, there are
new stages. So, you'll have to make new folders for them with the correct names. The new stages are
chemical
cutman
moses
zebes
In the music folder, make new folders with those names and insert your music in the corresponding folders. You can now use MP3's as well as Oggs.
Also, be aware that the game will work without music now, if you don't have the old music.