Not sure why you don't understand it, I want it to center better than it does. Nice to know you need additional programs/software to do that with a game made in the mid-Two-Thousand-Teens, though.
As explained before, the game doesn't use vector graphics, because everything is hand-drawn.
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This means resizing things is going to cause issues, because engines can't usually scale pixel art well if there aren't vectors involved or if it's not "faux" pixel art (like in Dead Cells, for example, which is actually a 3D game).
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As you can see, the programming and science behind doing these things is fairly complex and engine-straining, which is why we don't have it in our game
currently given all the other complexities going on with it.
We do plan to have something like that for the full game, but it'll take time and a lot of hoops to jump through to make it so it doesn't look bad.
(I would similarly question why you're needing to use WinRAR to open up games on a computer in 2020, though, or at any time, really
)