I really like the game concept.. a game inside a game.. it sounds really fun. The conversations between characters was also really good. I like that every characters has their own special skill, so that they are all useful in their own way when exploring and passing challenges.
The puzzles seemed interesting too, I was only able to finish the first two though, in the third puzzle (with the fire imp) I got an error "TypeError undefined is not a function", it happened only after I was able to use the shield skill to get my character to the other side. When I pressed q or w to change character I get that error. I was able to change characters when I entered the puzzle stage tho.
I also think you should make the 'ghost' guy solid, I kept running through him even when I wanted to interact with him, actually I didn't even realize at first he could tell me how to solve the puzzles.. lol
Overall: It was a cool game! I'm really liking the look of it and it's too bad about the errors. I hope you'll fix this as soon as possible so I can give the game another try . :P Keep it up and good luck!