So far, this game delivers in all the areas that interest me: art style, the girls, situations/poses, and animations.
However, if I had to criticize anything, it would be the animation speed. I think the maximum speed is too fast, to the point of becoming unrealistic, since it's just the same animation sped up, and the movements become ridiculous. Many games suffer from this, and I'm not suggesting you create variations of the same animation depending on the speed.
What I do think is feasible and would be an improvement is toning down the speed in general. The current slowest speed feels like a normal speed, so we don't have a truly slow speed, and the fastest one is, as I said, too fast.
Another thing that would improve this point is if, when transitioning from a scene to ejaculation, the game displayed the animation at the same speed you had selected (or a slightly faster one), instead of cranking it all the way up. It feels quite jarring to suddenly jump from normal speed to supersonic speed.
Aside from this, the game is overall one of the best I've played recently. I hope this feedback is helpful and that you continue with development.