"I can't understand who criticizes the ending" - sorry, but did you play the game? It starts with an old man dying in his house. They claim it was an accident and no one even bothers to investigate what really happened? They don't check the house, nothing and the main character inherits the house without any information about the basement below - even for a short horror game, it's just a logic flaw, big one. This developer has made great games and making a story mistake like this doesn't look good.
Furthermore, if you actually play the game, in the end the character says that several renters have disappeared. Where did they go? You expect me to believe nobody even asked questions about it? In the game there is a literal poster ad for the cabin and it is made by the protagonist's SON and HE DID NOT EVEN BOTHER QUESTION WHERE IS MY PARENT.
Edit: The game is good, but ending is a mess, sorry that's factual and you can't objectively prove me wrong. If you like the game, that's good to hear, but don't just say that you don't understand people, who didn't like the game, sounds a bit snobby.