It doesn't seem to like Firefox + Flash either
Here's what I get on Firefox- https://www.newgrounds.com/dump/item/8270d419829e0cfde1453d6b061cef99
If I click "Run Adobe Flash" it works. If anybody is getting something different, feel free to send screenshots to dan@53xy83457.com. Otherwise, I'll be sticking it onto Newgrounds later anyway. Should work from there regardless.