absolutely awesome...tricky as hell!
Just finished first level - hope you manage to complete some more.
My screen seemed too dark and couldnt find any options, but your youtube video showed a lot more detail than i could see on the gun.
Keep up the excellent work! loving the retrospec feel of it all - great interpretation of a great game.
I think the original character could kneel also, so maybe a C or CTRL to crouch option might be a good move also.