Any regular or small text with outline is hard to read, but those resource requirements make you squint :)
Here's Imgur link if Itch will downscale the original image: https://imgur.com/a/Ue4Hvza
Alright, there's two easy fixes for me to do (apart from doing a whole UI rewrite which is eeeh not my favourite idea right now). One is to make UI scale to no more than 100% - which wouldn't make the text larger, but would make it, y'know, pixel-perfect. The other is to turn anti-aliasing on. Right now, it's on if your resolution is less than 1080p - but I could turn it on for all resolutions but 1080p.
Writing this out, the best solution is probably to do both and make an option in the options menu to toggle between them.