Someone here knows mari0?

For those who don't know it, it's an old Mario fangame that combines NES Mario with Portal.

This is a gameplay of Markiplier

I discovered this game when I was 9 years old with a tutorial on how to download "the original Super Mario" for PC, and even though I understood that it wasn't the original game I still fell in love with it and had a lot of fun 

This game broke my brain when I first discovered it. Just the idea of mario with a portal gun was so cool. Portal gun is just one of those things that when you add it to any game it makes it 40% cooler. I genuinely thought it was an official game crossover cause I didn’t know what a fan game was.