Why horror?

[Your Computer]

All these games have mostly flat grounds with platforms you have to jump on. I think it would be interesting if someone would try make a platforming game with the amnesia engine. I mean the engine is perfect for it.

I'm in the process of making a custom story consisting of mostly platforming, and i'm finding the engine to be a bit restrictive, forcing me to find complicated ways of doing what i want in order to keep the game interesting. Platforming is alright, but you'll run out of interesting ideas quickly and things will eventually seem rather repetitive. I don't know about the games you've listed, but i consider Assassin's Creed one of the kings of platforming, and i'm finding things a bit tedious and difficult trying to duplicate some of the mechanics. If HPL3 was out, i probably wouldn't, but until then we are limited in what we can do.