Out of memory - html5

Hello there and thanks again in advance,

together with two friends I am developing a small 2D project with around 10-20 levels right now and succeeeded in building and deploying it as HTML5-version without any big issues using the unreal frontend and emscripten. It’s working quite well (at least on a local machine) and I also managed to keep the file sizes down thanks to your help here at the AnswerHub. Now I’m hosting the game (right now for testing purposes) at http://mz-host.de/GrammarFactory/
In addition I activated compression in IIS8 on my web server, which seems to be proven by http://www.gidnetwork.com/tools/gzip-test.php
So there ist just one obvious problem that remains: Everytime I call up the website and the html5 applet begins to load, I get the error message, that the application ran out of memory. It does’nt matter whether I use a 32-bit or 64-bit browser. Apart from that it’s working locally with both versions on my PC and notebook.
I tryed to further analyze the auto-generated source code part of the website and it seems to spit out that message in every case an error is ocurring.

So what do I need to do to get the game up and running?
btw: My Server is running Windows Server 2012 R2 in a Hyper-V virtual environment. Every other website hosted is working fine.