1) please follow the bug report guidelines and provide a .capx that reproduces the problem. As our guidelines explain it's generally not useful for you to send us your entire project anyway, and reproducing the problem in a new .capx means you can share it.
2) can't reproduce on Windows 8.1, I got as far as 9 instances of Chrome running Space Blaster and it worked fine. Also IE does not support AudioContext, did you really test it and encounter the problem there? You indicated it reproduces on IE.
3) the error message is probably right and you have a hardware limit which you are running in to.