Loved the QUack Quack! samples in the music! Really fun and energetic. At first the game seems simple, but once you add a few enemy patterns on top of each other, a lot of complexity starts to emerge! The levels were really well designed and easy to understand everything visually at a glance. It felt like I was getting really close to the end, but I gave up on the 3rd level. Had a few frustrating 'bad patterns' from the bouncing crystals after the skull room that killed one of my runs. Overall, REALLY felt authentically NES. I especially liked the detail of sprites disappearing during the room transition animations!