So full disclosure: I love this guys games. Akari and the Abyss got me into binding H-Games, so the chance to go through that as a shapeshifting shrine maiden? If I could pay him, I would.
Saki and the Crucible of Debauchery is a straightforward game, designwise. There's several levels, during which you will advance through them automatically; most of your encounters are going to be battles, but there's also traps and treasures occasionally. The battle system, in and of itself, isn't terribly special for an RPGMaker game; you have several skills with varying cooldowns, though this one does add in a twist by having skills you can only use (or get a benefit from) in certain forms.
The H-Game aspect of it comes in binding attacks; the enemies will first try to strip you, and once your clothes are fully torn, they'll try and catch you. Midway through the game you'll get a skill that makes it impossible to be held while it's active, meaning you'll only have a narrow window where you can be caught, but why would you play an H-Game and not see the H-Scenes?
Saki uses a system I usually only see in MSub Games: Sexual energy. Every time you climax, you lose one energy point. Lose all of them, and it's game over; you're back to the start. Also, most enemies will advance their hold if either of you climax, and some have as many as five layers of binding. Struggling free (something not terribly hard, with the exception of the cooldown) breaks all layers, but if you're caught again you're plunged all the way back down.
There's also some status effects that will increase lust damage taken, and make it harder to struggle, but they don't seem to have a terribly large effect on gameplay.
It also includes several anti-frustration features; one of the items you can get fairly easily are potions that increase your abilities (and all of them can be used together), all bad statuses are restored when resting (though you get items early on to reapply them as desired), and should you fall in battle, you won't be forced to go all the way back to the start again; in fact, bosses don't heal when you're defeated, meaning you won't wall on a boss you can reach and damage.
If I had a complaint (and I do have a couple), it's that it's still not clear what the lust crest does as it advances (it increases lust damage you take when it's active), which feeds into my main complaint.
The story is fairly passable (Saki is a shrine maiden fighting demons), but Saki herself (much like Akari) is pretty flat as a character. The voice acting is very much appreciated, but it would have been really fun to see her reacting to various status effects, or have them come into play in the text during H-Attacks.
All and all, like his other games, this is a well-designed game, the images are top-notch (You get extra points in my book for avoiding the use of AI images), and it balances difficulty well; it just would have been nice to see more on the story side. I'm still giving it five stars, it's an amazing game and...does exactly what it's supposed to, fill out a gallery of sexy poses, but there's still room for improvement.