Releasing a game with memory leaks may happen, it's okay. Releasing a SEQUEL to the SAME GAME, with the SAME F**** BUGS in spite of all the comments on the first episode ?! That's just outrageous. 1/5 as long as it's not playable without reloading every 3 minutes.
Far more simple solution for the last level : just cut off the ropes holding the triangle to put it as a tremplin, destroy the "car" of the vampire, and let it roll. It jumps, it touches the human, and there we go. No need pixel-precision skill...