Oh wow! This is a surprise! I highly recommend this game, it's really fun.
Also, the sound effects work for me last time I checked. Maybe it depends on your OS.
I was wondering about the whereabouts of the patches Spacemaniac made? They had changes such as new specials that can change projectile types, the ability to summon dummy monsters, and more that I can't think of. If I remember right, there were a few cool addons that were made with that patch's abilities. If you know where it is, could it be added to the downloads section?
That's the thing... when you post something here (or on any similar site, for that matter) it HAS to be yours. It'd be one thing if you were using the Mugen engine and most of the content added was created by you, but that is not the case.
There are plenty of Mugen based communities that accept these kinds of things. Who knows, maybe some of the characters here are rare and highly sought after?