Everything about this is spectacular! The diagonal pixel-art visuals are gorgeous, the playfield is very clear and readable, the music is incredible and fits well with the aesthetic, and the gameplay mechanic is a very clever utilization of the theme that is perfectly implemented! It's extremely difficult, but it's not frustratingly so – I kept playing until unlocking the final challenge, and had to stop when I realized I'd probably spend at least a couple hours trying to beat it.