As someone who's very much into the denial/chastity kink, this game hits every spot. Now, granted, while there is already some great content, the game just feels like it needs and fits at least 10 times more. But mind you, it is totally worth it for a good playthrough already.
Starting with the artwork this game is already so beautiful. Tasteful style, perfect choice of fonts, phenomenally looking UI design for Ren'py. Basically, every visual element ties together perfectly.
The mechanics are somewhat standard for a trainer game with the huge exception of the punishment system which is sort of a mini-game that's beautifully coded. Simple and effective.
The writing literally put a smile on my face. The mannerisms of old literature are very nicely sprinkled throughout the whole script. It really shows just how knowledgeable the writer is.
And that writing coupled with the punishment mechanics lead to the lewd scenes. Man... It's hot. I absolutely love the direction the lewds go to and it really shows, again, just how much the writer knows and feels about the denial kink as a whole.
TL;DR The artwork is top notch, the punishment mechanic is awesome, the writing is one of the best I've seen in a porn game, the lewds are 10/10. Beautiful game.