It looks great! It seems to be resource intensive though, which is a shame. Also I probably wouldn't wait that long for a site to load in most cases. It took about 7 seconds and I have a 50 MBPS fast cable internet connection. Congrats on getting it to work nicely in all the browsers (minus the sound in IE but that's minor IMO). I tested it in Chrome, Firefox and IE and it worked well in all of them. That's not an easy task. Well done, I know there were some folks on here that thought you were crazy for trying to make a website using construct 2. :) I hope you're able to get the load speed down and make it less resource intensive.
To answer your question, here's a chart of which sound types currently work in which browsers: