It's not a surprise that nowadays most of players has full HD displays (at least).

Having accepted that I made some changes to the engine and UI layout descriptions.

From the very beginning the game supports mods. 

So I just made an HD mod - added one more data directory for HD sprites and settings.

P.S. Unfortunately the Itch application does not display game alternatives when you press the start button, so to play SD version one has to made a trick - swapping the play actions in the .itch.toml file which resides in the game directory.