The isometric view is very cool and certainly makes your game stand out as unique against the others in the contest. Unfortunately, I think it needed a little more time fine-tuning the controls within the perspective / arrow key use. The movement did not feel very natural and led to a lot of trouble when trying to complete movement-based puzzles.
Your music is fitting for the game and the expectations for the player are clearly established!
I think this is a really neat start to something, but definitely needs a little more attention to detail, overall.