Holy wow, you work fast. Hm, let's start with the first one: I really like the fluidity of the loop, especially the hair and breast bounce. The subtle details of the gaping/drooling mouth on the MC and the blinking are both nice touches, and the shading is incredibly well done for 8-bit. The only things that don't seem quite right to me are a single extra pixel on the dark blue part of the slime's eye (which, to me, gives the impression of bags under her eyes, or that the white spot is her pupil, and the dark blue is her iris, which is then too big for her head) and that the MC doesn't seem to be laying flat, nor propping himself up (just sort of floating). It almost seems like he is stiff as a board (in more ways than one), and is being pulled up by his penis. Whew, hopefully that isn't too much detail. Anyway, onward to the second one.
This one has all of the good stuff the first one has (excellent shading, nice attention to detail with the hair bobs and the MC's mouth and eyes, as well as flawless fluidity), in addition to a very nice sway cycle on her breasts, a pose for the MC that makes perfect sense, and even a nice glow/shine to her flower. As for a few suggestions, a rustle in the leaves or if his feet were dangling would be a nice touch, as would if her eyes or mouth had a bit of animation. These are just touches you could make if you want to, of course, with the only thing that looks weird being his perfectly straight penis. According to the first picture, it shouldn't be crazy long, so if you added a piece of the head to the last frame where he is pulled out furthest, that would likely look more natural.
I really hope this isn't too much of an opinion dump, and that at least some of this is useful. In any case, I hopes it's going well, and that that you add Bowsette to the list of monster girls.
Good luck, my friend!
