these are my suggestions
more slime types have each different slime use you in different positions
rotation for building placement
more advanced slime (slim male/female humanoid)
new potions that have unique effects like larger breasts, ass, thicker body, thighs
a way to lure slims to place you want them
a way to make them stop running around during sex
if you get over filled with slime cum you gush out the current volume of cum with a way to increase the max volume of cum you can hold
better character emotions as she seems to have i blank face now mater whats going on
also game looks grate but the motion blur is a bit rough