Beat both levels. It would be nice on the second level if there was some sort of indicator about the red herring exit door. Maybe cracked ground or something? It's rather frustrating to just fall through ground that you thought would be fine to stand on. It also made me paranoid for the rest of the level.
Another checkpoint in level 2 after that first hallway of knights would be nice, that jail-beam section is a bit tricky and it was irritating having to get past the first beams and the knights just to take another stab at it.
Sound files are good, a bit out of sync for the animations. I noticed as well in the tentacles sound file you can still heal some guy huffing and puffing along.
I like your art as always, I'm not big into the whole BDSM thing so this new piece doesn't appeal to me as well. But I can't expect everything to be made according to my tastes!
As far as pricing, I'd rather pay the extra dollar if it helps you out more. In my budgeting mind, I look at everything under 5$ as one price, and everything between 5-10 in another. You could cost it 3.50 or 5.00 exactly and I'd be calculating it in the same way.
Also, I find level 1 has a bit too much walking for the amount of active sections. There's that first knight, the stationary knight (I don't quite get what he's all about) the small pit, and then beams. But we get probably 2 minutes of walking in between these areas. I bet it could be cut in half and still fit in everything you want to get across.
Also, will there be somewhere it tells you about throwing rocks? I found it out by accident, and it's almost impossible to progress without it.
EDIT: It would be nice if the checkpoint was something that wasn't an ugly yellow box. I thought it would kill me if I walked into it at first.