That's right. As explained in the FAQ, and mentioned less than a week ago, web games have tighter limits. It's not just about archive size. Please try to optimize your game, because the browser adds considerable overhead, and most players won't have top of the line PCs. Thanks.
So I think the only way to decrease the size of my assets is to use asset bundles. I have quite a few assets from the asset store including some audio. If I use asset bundles, would that delete the tile maps that I have already done in my levels and would I have to reinstall the assets. That is why I've been scared to do it I do not want to loose my progress and have to recreate a bunch of levels.