Very adventurous :D
surprisingly good for it's genre, you really get the tomb exploration feeling :P
very nice graphics, good puzzles and a fitting sounddtrack on top of an awesomely done theme make this an enjoyable 10/15 minutes.
-SPOILER ALERT-
And now for the critisim part:
The note you found at the end was really well done, awesome idea. It had me wondering what kind of infernal creature could be lurking in the tombs below. The bossbattle was well done, though i'd at least expected some kind of ancient creature instead of just a big spider. Also, it would be nice if the boss had multiple stages, and not just do the same thing. I did like the little addition of you only being able to damage it at a specific point for a short time, cancelling out the brainless "fire at will" type boss.
After the boss however, i was quite dissapointed by the ending.
There was plenty of opportunity for a cool "Let's get the f*ck out of here, NOW" scene. You should definately put that in.
Also, the game was relatively short. I'd really enjoyed it if you made more areas like the first one with the swinging axes. More boobytraps in the next version!
And I think you should make more of these "bosses" besides the spider, giving you different directions to go to for some variations and facing multiple bosses at the end of each tunnel.
Finally, the inventory. It was nicely done, but it seemed a bit of a detour to open the bag with the mouse, selecting the shovel with the mouse, shoveling dirt with the mouse, reopening the bag with the mouse, putting the shovel back... well, you catch my drift. Hotkeys would be nice.
Also, more -useful- items are always a plus. It could really be a nice addition to find some keystone-translation thingey or something, and remembering you have it and need it to solve a puzzle 10 rooms later.
Overall an exellent game, congrats.