Um...
I hope this isn't actually meant to be ~watched~ by 3 and 4 year olds... that might not be so good... The only real problem I had with it was that I didn't really like that I had to click play after the preloader was done and then click play again.. or extras.. I just feel like those two options should have been there right off the bat, but then again that's nothing major..
Through the whole thing I was kinda like 'What does this have to do with eating healthy?' until the Spartans started walking around with food at the very end, and then I got it.. I know you said you purposely didn't have a story line but it seemed kind of like you wanted to make an animation about the Spartans doing what they do best and then decided to throw some healthy stuff in right at the end just for the sake of doing it...
(Sorry if I seem like I'm being too harsh x.x )