There's 2 more areas to be unveiled. Any guesses on what the themes will be? The snake one is clearly norse mythology (hugin and munin the raven hats, bearded vikings, the snake Nidhogg which eats the roots of the world tree yggdrasil).
So what, Norse, Greek, and Egyptian?
Also there's a cheap 'dark helmet' in the rubble at the back of the snake - I bought it but it doesn't change any of the dialogue in the levels. Looks like we're going to have a timed release on the other rooms.