Interface needs some tweaking. I can't see the bottom 3-4 tile-lengths of any given screen regardless of how I resize the browser window. I can move the character off the screen into those 3-4 tiles, but cannot see the character when I do so. This obviously makes it quite unplayable for me.
Standard 16:9 3840x2160 resolution in a Chromium browser. Haven't tested since, but the issue did not resolve regardless of if fullscreened or not and also did not change regardless of how I resized the window. If you are relying on system fonts/settings for graphical projection that might be the issue as I have system font sizes scaled to different values depending on the application being used.