Well I think the preloader needs to be a bit more obvious that is a preloader...but I'm just a noob I guess...
Well the art style is really fantastic. The animation though is a bit stiff, but that's actually okay so long as you make the animation more dynamic. If you have lots of interesting shots and imagery to go with the music it won't seem like I'm watching a "still" picture. It's difficult for me to explain but I guess to sum it up, if you're going to rely mostly on motion tweens for animating, make sure you have a variety of them. Don't do long takes either, change it up.
Good luck! Hope this was helpful!