Superb presentation, I love the 2D art and the guitar riff at the end.
I was pretty happy to see that you went with instant movement.
The gameplay is fun too. It's simple, but I thought it was actually more original than if it was either rythm or Simon says. In the context of dugeon crawling you could have added a couple of consumables which earn bonuses or special moves (where a guitar riff would have been appropriate, although' the game ending in a climax is good too), but in one week we certainly don't have time to do everything we'd want to.
The narrative of doubt does fit the theme. However I don't think the theme has that much impact on gameplay (failure or success is a bit mandatory) I did not get if there was any difference between the two colors of lines so maybe there's more.
Very cool entry, it was pretty fun to explore.