I'm on Linux Mint and whenever I try to launch the game, I get the message "./rawexec: error while loading shared libraries: libSDL2_image-2.0.so.0: cannot open shared object file: No such file or directory".
Sorry to hear that! Looks like this is the same as https://github.com/PleasingFungus/Silicon-Zeroes/issues/113#issuecomment-3357714..., though it doesn't look like people ever completely sorted that one out.
I sadly don't have the ability to investigate this one any further myself, so I wouldn't fault you at all for refunding the game.