What an unusual take on NES games—I love it!
I'm usually not into parody games or games that rely heavily on references, but the Tetris blocks used for climbing and the pipes that rotate the world were really clever ideas. The Pac-Man section was a bit tough at first, but then I remembered I could wall jump, and everything clicked. Great job!
I think the core concept has a lot of potential on its own if you move far enough away from the direct references and let it become its own unique world.