Is the Chrome books one of the high-res (screen) models?
There seems to be an issue (I don't personally have one) where Android apps aren't properly scaled, to account for the high screen density.
In terms of the app itself -- it fully supports Android's varying screen resolutions, the UI and font sizes are visually the same between a 5" 480*800 screen and a 5" 1080*1920 screen.