Art was pretty good, colours were bold.
Go open this anim in flash right now, click on any classic tween, look at the properties bar, find the Easing slider. Use it for everything. Easing is one of the most basic animation concepts.
Also if you use Newgrounds' Swivel for swf converting you won't have any lag at all, check it out here http://www.newgrounds.com/wiki/creator-resources/flash-resources/swivel