Hey there, thanks a lot for the answer!
I didn't know blob is for local downloading. That makes this a lot more concerning. The zip we uploaded is coming directly from our unity cloud build setup. I can't see how that would have gotten infected. Here's a link to our webgl zip: https://drive.google.com/open?id=17GRKiDZowuip0tr3vFeIa2TK-6zPY-41
We've took the browser version down because of the security concern.
I can't find anything suspicious in the index.html