If you want to make that kind of game, Adventure Game Studio should be your first port of call: http://www.adventuregamestudio.co.uk/
It's designed so that artists and writers can produce LucasArts-standard point and click adventures without a ton of programming knowledge. Tons of great games have been made using it.
so ... I read that link, the features, then half of http://en.wikipedia.org/wiki/Adventure_game and now I want to know what would be the adventure game equivalent of Autechre + Gaarg says so I can take a look and see if this is something I want to play?