Whoops! That's supposed to be handled automatically but I guess not on all machines... Sorry!
You can fix it manually by right-clicking your console window, selecting Properties and setting Screen Buffer Size under Layout to Width 120 x Height 40. I'd also recommend setting the Font to Size 16 Consolas if it isn't already.
To ensure it works properly, set those same settings under Defaults (also available when you right-click the console window title), and run the program again!
I'm so sorry for the inconvenience... Thank you for trying to play!