Amazing work! It feels like a legit improvement over the original, yet keeping the exact same spirit - almost as if Tom Fulp made it himself.
I will say, the hitboxes on the enemies and the shootable targets felt a bit iffy, it felt like my gun was jammed half the time despite me spamming with all my might. Also some extra juice of like, making the enemies flash white when they're shot and making pico flash red when he's hit. I AM pretty blind but like, panning my eyes around the screen to see if I'm winning/losing depending on the status of the bars was a bit annoying.
That's just nitpicks though, the overall product is really well done! Great work everyone involved!