I played the demo and I have a few criticisms. First I want to say it is remarkable how much work you were able to get done in such a short time (on the pics I mean). Pics take me eons to do and I dread them!
First thing I noticed was that you cannot really "look" at almost anything. I know it's a demo, but this will be important in just a minute.
Second, when I entered the cave, I do not believe you have a way to get out of the cave.
Third, in the cave, I have no idea what the yellow/gold things are on the ground. I tried looking at the ground to see, but the "look" message gives me no input.
So I ended the gam ewith 0/5 puzzle points because there is virtually no interactivity in the game.
Again, I know it's a demo, so I'm not trying to be harsh. Just treat this as a beta test review

EDIT - I looked at your website and I lol'ed when I saw how you made your canyon beast! I used the exact same black and white pic for my horse sprite! It worked very well. Finding a running one was harder, but I made one and you can use the sprite (with color modifications of course). It may save you some time. You can find it in the art gallery (public domain)