640x480 compatibility does not work properly

[Joe2500]

I'm playing a game called Zapitalism Deluxe, which forces fullscreen at all times with no option to disable. This game was intended to run at 640x480 resolution but works fine on normal resolutions (all of the UI scales up). However, none of the images scale to fit the screen size which makes point-and-click actions difficult.

Normally, if you went into the properties of an executable, you could enable an option to run the program at 640x480 for compatibility. This does has an effect on the game when running it through otvdm, but all it does is move all images to the top-right of the screen, instead of the center. It also makes some animated graphics display incorrectly.

What the game looks like normally

What the game looks like with the 640x480 resolution option enabled. Enabling 256-color mode (the intended color mode for this game) still messes up the animated graphics.

Expected behavior: entire display scales down to 640x480 and the game displays as intended
Current behavior: display does not scale down at all and some graphics display incorrectly