An advise to you. You shouldn't submit demos to the portal. They are more likely to receive a blam.
This leaves a weak first impression to me. It's not the lack of sound, but the content itself is barely showing anything. The graphics are untouched, so no comment to that.
PS.: Don't take this statement by heart since it's my thought.
Sprite animation may be losing its charm, but only because it has a bad reputation and this doesn't make it better.