Hey!
You might be interested in a solution that uses less blocks (i would be). I might have been lucky, took me 2-3 minutes to find this.
https://blockly-games.appspot.com/maze?level=10#taj4p4
Does anyone know of a better one?
Edit: just as i posted this i saw that you dont even need the first "Move Forward", so it is 10 lines total with 4 blocks left