🐝-mode is for editing code. By clicking on a tile, the cursor is placed on it. The
cursor has a direction, and every time a character is entered, the cursor moves in that
direction. Pressing the arrow both moves and turns the cursor, but using shift+arrow
keys only turns it. Backspace moves the cursor in the opposite direction of where it's
Click: place the cursor facing rightwards.
Arrow key: Move the cursor, direction follows the key.
Shift+arrow key: Rotate the cursor in place to face the way of the arrow.
Backspace: Move the cursor in the opposite direction, delete the char.