That tilted look is due to the PS1 graphics hardware lacking perspective correction for projected textures. It gave its games a very distinctive look.

Well it's a 2D game so the PS1's quirks of 3D rendering don't even apply.

I know what you mean, tho. That unique look PS1 has because it didn't use floating point integers for the vertices, so whenever the camera moves, the models look like they are shifting/wiggling as vertices jump from point to point in the most unsmooth manner possible?