The game works ok, but I think Body Heat pulled off that mechanic better. The oral slot being limited to just the mouth means it's almost uselessly small (you can only fit two gears in there, three if you keep your hand on the mouse), and doesn't have the digestion factor. Digestion, IMO, was vitally important to the mechanics, because not only did it counterbalance the pussy slot (with its orgasm meter) by giving the mouth slot that aspect of time pressure, it also gave said time pressure some motivation to exist because digestion was what allowed you to heal. Likewise, the pussy exit facing down and the added focus on inventory inertia makes stuff much more likely to fall out of you (whereas it was actually pretty tricky to get stuff through the cervix in BH). The hands needing to be free to climb over ledges in a game with already very precise platforming, combined with the risk of objects falling out of your mouth/pussy and into your hands mid-jump (due to inertia) make for a frustrating duo, compared to Body Heat just making you drop what you were holding at the start of your jump, IIRC.
Don't get me wrong, I'm glad to see that concept coming back and I think it's an idea with great potential, but I don't think the mechanical changes here were neccessarily an improvement.