Blocky menu text at resolutions above 1920x1200 (e.g. 2560x1440). Any fix?

[Doctor Hades]

I haven't played this game since I had my old 24" HP 1920x1200 monitor and a GTX 980. I now own a 2560x1440 monitor and was surprised to find that the game appears to support the resolution from the in-game menu but anything above 1920x1200 results in very low-res and blocky looking menu text as it is being rendered at 1280x720 or lower!

1920x1080 looks fine, although it is upscaled on my display, and 1920x1200 also still looks sharp (though displayed in a black framed border) but 2560x1440, even 3840x2160, looks dreadful. MSI Afterburner's OSD appears to be rendered at native resolution though so the in-game resolution may be 2560x1440 but all the menus and text just look really ugly.

Does anyone know of a fix for this please?