I gave it a go, too. Very good! The game doesn't hide its Indiana Jones references one bit.

It's fun to play - the characters bicker and have fun personalities (although you're playing on stereotypes, which I don't mind in this genre at all). The voice acting is quite good, I think. I couldn't tell it was the same person voicing different characters. Good job!
The puzzles in this demo are of the rewarding multi-step kind, which require some work and searching, but I felt progress and was very pleased when I solved it. The game looks and sounds like an adventure movie. Big kudos for the theme music and the close-up animations!
I also noticed the Spanish dialogue Rik mentioned. In addition, when playing with Spanish speech (I had to have a go just to hear it - did it with German subtitles just for the heck of it), the captain speaks English in his answer to Doc when he returns to the first chamber. It's such a short phrase, it could be intentional and no error, but I thought I'd mention it.
In conclusion, the demo is very promising and definitely makes the player yearn for the full game.
