All the sounds were sourced from what I believe to be the public domain, from open sound libraries to various mod communities, aside from the achievement sound when finding an easter egg.
One of the most badly designed maps I've ever seen.
TIP: try actually making new games instead of re-releasing stuff we've played a gazillion of times.
It seems that due a recent strange "security update" the .sol for the game was moved from the folder "pRotectoR-kONgRegate-1_0.swf" to the folder "Protector_Final_Secure.swf". If you want to get back your lost progress, just copy your .sol files to the new folder.