I beat the copy of yourself! If you remember, I mentioned he eats a candy bar: you inflict the final hit while he eats it. Then you get the candy bar

Screenshot of after the battle:

The next screen has no save point, but resembles the end of a Mario level. A stair of blocks, suddenly ends and a flag is at the end. I jumped on the flag (DUMBEST IDEA EVER), and fell down with the flag for a bit, then I touched the right key on accident and died

The flagpole kills you lol
There is no save point, meaning that I have to do it again lol