For a free game (as in apparently free straight from dev) I can't complain, it does what it describes to do, but one can't think it has more potential, nicely animated, I have no idea how Live2D works to make those 2D sprites look so 3D, also first paizuri game I've ever played that has x-ray... which is actually kinda nice... if the game had any kind of customization... which it hasn't... becuase it's done with Live2D and that would make it quite hard on some levels. One can only hope the dev goes all out with a proper, full, paid title that uses 3D graphics and implements customization of breast size/shape, penis sizes, size of the loads, build-up of cum, etc since sadly this current version doesn't offer that much, you get 4 slow animations (at least it says so, personally when clicking on slow I've only notice 2, maybe 3 slightly different animations, not that different tbh), 1 fast animation and then cum, spit + camera controls, x-ray and clean button (which is kinda unnecessary as I mentioned earlier, there is not much cum build up, only 2 levels and spit in itselfs doesn't change appearance of penis/breast by making them wet, nor do those 2 "sliperryness aspects" influence the animation), you also get manual mode where you control the movement.
All in all, good idea, good art, good animation, good execution, but lacking in variety and replay value.
Try it, but don't expect too much, it looks better on screenshots than it really is (sadly).