If you're anything like me, you've played so much Spelunky that you can close your eyes and generate new levels for Derek Yu's roguelike platformer inside your own head. Here, look, I'm doing it now - bet on what's going to kill me...It was a frog. Sigh.For a more technical understanding of Spelunky's procedural level generation, take a look at Darius Kazemi's browser-based Spelunky level…