I don't see how the theme is used in this game...
Just having a small window isn't enough...
I know you only had 1 hour, but you could make a lot more within that time than what you're showing here. Try adding a light circle around the player, or have the enemies fade in as they get closer to you. Maybe have them increase their speed the longer you are alive, and your time becomes a highscore system. I think all of that is possible within one hour.
Good luck next time!