Penumbra Engine

[Astek]

Hey guys,

I would just take a moment and congratulate you guys on all
the success for your hard work. I personally loved Penumbra Black
Plague and I feel it is the best survival horror game to date.
I too am an indie game developer and your engine has me wondering.
I have to guess that you guys coded this engine yourself...
but if you guys would like to drop me a little overview of what you
guys did to get your engine so well and then construct Penumbra,
I would gladly appreciate it. Also, if you can refer some tools you used...
I wouldn't mind that either.
Email- astekgames@hotmail.com

Thanks Guys

Dave