I’m pretty sure if this had come out on the OG Gameboy, we’d be talking about it.
Loved the aesthetics, and the main game loop is pretty tight. Some jumps get kind of annoying if you miss them, but that’s just level design and can always be revised.
I think you’ve got a good solid base here, add 9 more levels for a world and make 5 worlds and this would be a solid release for mobile, Switch or even Playdate. If you don’t know Playmate, I’d recommend googling it, it’s a portable game console with a crank on it that might be a good match for this kind of gameplay and art style.