Background Music and first Sound Effects online, also some tweaks here and there.

http://rialgar.de/LD23.xhtml

Tested under Chrome, FF, IE and Opera, best with Chrome or Opera, IE has no sound.

Still to do:

Character Sprites

Enemy Sprites

Terrain Graphics

Death Animation/Sound

Have a look on the collision, I sometimes get stuck in walls. (At least introduce a “back to last checkpoint” key)