I feel you man, level 3 was hell until I put actually thought about how to beat it instead of brute forcing my way, my tip is to make a quick save before EVERY split in the road and keep going in circles
Protip: make sure the clawed girl is right behind you so she cant surprise you.. then keeo going. There will only be 2 dead ends with keys so expect 2 battles. In the battle focus on draining her mana so she wont hurt you as bad. If you stop draining her mana by going to fuck her she'll hit you hard trust me