Found 2 bugs:
bug 1: When i killed the first enemy (trought the hall, opening the door, the enemy with a jacket), he drop a rock. If i not take the rock and leave (and back again), the rock dissapear.
bug 2: I took the key in the blood, appear new "boss" (like the RE licker), and he kill me. I come back to last checkpoint (the blood in the sink) and dont appear the arrow and i cannot leave the zone.
Sorry for my english, but i have to report these bugs to help the game developer.