Well, it looks like an enterprising young fan has figured out the .HHA format. Seems the game uses a modded flash format for pretty much the non-3d stuff. You can play the scenes without your character in a normal flash player. There are also some neat-o flash easter eggs in there too.
These were found in the game.
Clicking on the buttons turns each part onto a fruitfucker.
As for mods, according to the EULA you assign all copyrights of the mod to Hot Head, so I wouldn't write any code you'd like to use else where.