Very promising demo! The intro is very good at setting the scene and giving the tone and it feels *very* Indiana Jones to me. Pulpy and humorous.
Some of the puzzles stumped me for a while but they weren't bad. I just needed to think differently. @author: if you want precise feedback, I could probably play through again and give a sense of what gave me a hard time and why.
Just looking forward to a full version :)