You can download it via the itch app and try to run it that way (you may need to run a local server for this), but it's a browser based game, so there's no dedicated desktop build. Are you having any particular issue with the browser version?
Ah, that's an itch CSS problem; I think if you click the fullscreen button in the bottom right it will resize down to fit, or you can right-click the game and do "open frame in new tab/window".
