I don't see how this is a screenshot. I also don't see as to why people give a shit. It's his art, and he can present it anyway he wants too. Get a life people.
Lol what's with everyone here saying its a screenshot? Even if it was a literal screenshot, if this person made the art then they are perfectly within their right to post it here.
Wrex, maybe because every single pixel in this 'screenshot' belongs to me. And it's mockup, if you think it's screenshot compare it to the game.
Looks like a fun little game. Glad to have been an inspiration :)
And: Even if it was a screenshot from the game, it's still pixelart. You folks need to calm down a bit.
I watched markiplier play this game the other day and loved the pixel art, wondered who made it! Nice, interesting asthetic and great pixelling. 
wtf is the big deal here; he's made all of the art in the piece, and combined all of the assets together into one canvas. a mockup is supposed to be a potential screenshot, especially if the assets are all completed.
10/10 art btw (y)
this is either a perfect pixel for pixel mockup, or it is just a screenshot
oh you made it? if you did then im sorry and good job