Wonderful animated art! The procedural motions felt fully fitting for all of the characters that the game can generate. There's a good sense of variety, and it's cool to see the customization of partners left entirely up to the player. Music and sound effects are all well matched to the action, and there's even a variety of moans.
The tutorial appeared too low on screen to be seen in the web version for me, and restarting the game still counted the tutorial as complete. An option to enable or disable the tutorial would be good both for players who somehow skipped it like me or those who want a refresher on the various mechanics.
It's really neat to see a game with sex as the foremost game mechanic! The variety of upgrades add strategy, a sense of playthrough uniqueness, and are a nice reward for making progress. Excellent work!