Creating a game using HPL2

[WesleyTack]

I like how people want to make "games" as if it's all doable by yourself. In some rare occasions it is possible. But for a game like Amnesia you need:

modeling/texturing artists
lighting artists
environment artists
animators
character modelers
voice over actors
sound designers
composers
producer
programmers
etc...

Mastering one of these will set you back quite some time already. So you pick what you want to do and then you stick with it and perhaps learn as you go to do more tasks. That's my advice to you. When you did decide, find a community that does what you want to learn and get support there to get better at it as you go along.