Yes, your eyes do deceive you - there are in fact no original graphics in this screenshot. I'm no artist, and as many others find, getting graphics for a game takes longer than actually writing the thing. I've used the graphics from the excellent Wyvern game, which comes with sprites that are perfect for my Gauntlet clone.
Here you can see the warrior wondering what that ghostly noise is coming from the other side of the wall. The red square is an exit, which can only mean one thing - that there is another level, though in the interests of keeping the surprise, I won't reveal it yet.
I do have a conundrum with the graphics though: I'm guessing that it wouldn't be right for me to release it with them, as they are not mine. There is no kind of licence information included with Wyvern, so I think my only solution is to email the author and ask him politely.