I’m sure a lot of you have figured this out, but you can get the embed to work perfectly in your submit page if you modify your export page to take up the whole page. It makes it embed really nicely. If you’re not very good with html and javascript I found a nice little tutorial to help you do that.

http://unitycoder.com/blog/2013/03/31/webplayer-100-width-height/

if you get it working right it will look like this: http://ludumdare.com/compo/ludum-dare-31/?action=preview&uid=26320