I've seen discussions for this elsewhere ( notably steam discussions), dating from as early as 2015, but i'd like to address it personally here for visibility's sake, as i feel this needs to be adressed for the sake of accessibility.
As it stands, the UI cannot be scaled and appears to have been made with resolutions as low as 800x600 in mind. This ends up being tiny on 1080p, which is currently the status quo for most users, let alone anything higher ( or on smaller than average displays)
I understand the game is virtually in life-support mode, but giving people to scale up their UI, even if it's just in integer factors, would immensely help with accessibility and gives new players somewhat of an impression that you intend for the game to be played on modern systems going forward.