Having got the hang of the controls and played for several hours I can give more detailed (and hopefully more balanced) feedback.
First of all I really like the game, on many levels. The art is great. The somewhat challenging difficulty, while a surprise in this genre, works very well. The dialogue is (for me anyway) the perfect balance between fetishy and funny. The characters have real difference and real integrity, and (so far in the story) appear to be showing progression. Again, very rare in this genre (rare enough in games in general). So that's outstanding. And taken as a whole, this makes the game succeed as a roleplay of being a slave, vulnerable at the hands of very powerful and quite dangerous female captors. This could easily have been constructed as a disguised "harem game" with a Femdom "skin". You have consciously and skillfully avoided that, and that is also impressive.