There are some problems.
1. Most people did not play games like Amnesia. They are grown up with shooters or sports games.
2. The little people, that are interesting in Amnesia, first look for an illegal download or wanted to play it later.
3. The paymant methods. Not every human has a credit card or a paypal account (like me). The mobile payment is a good step but it was coming too late.
4. Amnesia is very unknown (like the game's name before
). Only little people knew that game. Youtube is a great platform to distribute videos and to show the game around young people. I think that is the mainly problem, that Amnesia has no name in gaming world because it is an indie game.