The Battle of Venarium as the tutorial level, please.
Since Mr Holmes of Destructoid's wishes amount to pretty much "if it was in Conan the Barbarian, stick it in," I thought I'd give my ideas, continued!
A ripping SF-fantasy-adventure fraught with dinosaurs, barbarians, Transformers, heavy metal, monsters, spaceships, and all manner of madness.
Earlier this week, I considered writing about the Conan games that have come out over the years. The problem with that is they were all by and large horrible games, and two publishers released better Conan games the games actually based on the Conan stories. I'm sure the historically crazy Robert E. Howard wouldn't have wanted his hallucinations converted into horrible video games, but alas, they were.
By the use of the term "hallucinations" I'm guessing you've seen "Conan Unchained," where Howard was presented as a paranoid barely-functioning nutcase who believed Conan's ghost was coming to him late at night to dictate his stories to him. That's a massive misinterpretation of what he actually said in his letters, where he was using similes to describe how writing Conan was so natural it was "as IF" his ghost was present. There's no evidence of Howard actually having hallucinations of a long-dead warrior king.
I'd suggest you read Blood and Thunder: The Life and Art of Robert E. Howard, or at least Rusty Burke's "Short Biography of Robert E. Howard." Howard studies has made leaps and bounds over the last few decades, and commonly held "facts" have been soundly debunked. Howard was eccentric, true - what writer isn't? - but he's hardly "historically crazy."