This game reminds me a lot of Viotoxica, but instead of vore it's femdom although there is still one vore scene in here. The main issues I have with it are that you actually need to climb down ladders rather than fall down which is annoying at times, and that sometimes the platforming is really precise at times.
One of my biggest surprises is that there are no scenes with the sister. I was fully expecting her to be the final boss or a bonus boss.
Also when you defeat the Witch and the Ice Queen both of them will man the empty boat and take you to an area where you can fight boss versions of common enemies.