Glad to see someone else building the "seven" theme into the music! That's awesome!
You got really smooth and intuitive gameplay. I'd only recommend to make it far clearer when the game has actually ended. Since the game can be so short, maybe building in stages to the level could make it longer but still engaging? I know you might not have had time for that, but if you're looking to make it longer, that's my suggestion.
Well done!