In all the other games you can get shot a few times or a lot, and you won't die, but in this if you get shot once you're toast.
Interesting, though the comments are as expected (e.g., "Halo rocks, Contra sucks"). Hard to imagine anything different from a non-OG (yeah, that phrase just happened), but still kind of fun to get a modern take on the game.
This is the first video from Nerd Balloon's Project D, a 5-part series that has this kid traveling "back in time… to experience some of the most gut-wrenching video games ever conceived by man." I don't know about all of that, but I definitely hope the series continues.