Yes! Out of interest what's the size of your build? Mine is 20MB (and most of that is the music) - though obviously it's a very graphics-light 2D game. I'm not too knowledgeable about Unity's build system, but a side effect of my WebGL build problems was me cleaning out absolutely everything unused in my asset folders.
Viewing post in Jump Over the Rainbow! jam comments
Looks like the final WebGL zip came in at about 65M. I had read that Unity was pretty good about packaging only items that were used in your selected build scenes but I'm sure there is some additional fat trimming I could have done..
*edit* I also chose the speed over the size parameter in the build settings.