The game appears to lack high DPI-awareness - my Windows display scale is set to 150%, and the game window was slightly blurry until I enabled the application DPI scaling compatibility option in Zortch.exe.
Crouching with the default Ctrl bind does not work - I've had to set it to LCtrl instead. Perhaps it has something to do with my keyboard? (playing on an Acer Predator Helios 16 laptop)