No, Slash. It's not you. It's the game. Every level up to 7 has an extra key in it. There's some reasons for that, but you'll find out soon enough. (I found the game on another website, so I've been playing it about a week longer than most people. Gotten about halfway through Level 5.) As with HD, I'm working on a walkthrough for this game. It, too is in the middle of Level 5.
Anyway, now that the game is out in the open, I guess I no longer have to be secret about it, eh DFW? :) See ya!