Even for a sprite movie, this is crap. Only the barebones of Super Mario Bros sprites were used in the overworld, whereas in the CASSHLE, it was drawn crudely. How this passed and got 150K views is anyone's guess. Probably the joke is that it IS shit. Nowadays that's been done to death, especially from users who aren't capable of making good stuff and thus are dependent on ironic humor in order to survive.
Also, I only know Metaphor128 because of a short in Brawl Funnies, which has @Ukinojoe credited on it. Joe has a YouTube channel with 1.1M subscribers on it, and in 2012, he posted Bowja from his Cashle there. And turns out that he's a talented animator even back then, or at the very least more capable of using Flash.
I suggest the theory that Joe created an alt and submitted a purposely bad flash under the pseudonym of Metaphor128 for trolling or other unknown reasons and submitted a self-depreciating short to Brawl Funnies while his shitty movie was still relevant.