Drag and hold your mouse at the beginning to draw lines. When you're done, press space. Then arrow keys or WASD to move. Player type 1 is a filled circle, player type 2 is an outlined circle, player size is self-explanitory. If you are touching a line, the 'Touching Line?' variable will return one, else 0.
Pythagoras @So_Awsome for the point towards block Everything else is @triskedekaphobia Use with credit Make sure you backpack the ENGINE SPRITE, not the pen one