This game is absolutely amazing and I LOVED the ending!!! Next April Fools' if the earth still exists I'm totally gonna make my friends play this (or perhaps I'll get impatient and force them to within a week or two XD)
I also love that you provided extra challenges, but I think you may have forgotten a file in level2 of challengepack1? in level1 it gives you binary to convert to unlock the next level, but in level2 it only has the level3 folder and the helpdocs, none of which have what i need to decode in them, just help on how to decode (which obviously doesn't help much if I don't have anything to decode!)
other than that though, WONDERFUL game. fantastic. I cannot stress this enough.