One Line: Letters and Codes

You just received a love letter! But it's written with codes...

To read it you will need to solve the puzzles and get codes, which will serve to reveal the words of the letter. Each code is a word. Can you decipher what is written in the letter?

Use your mouse or arrow keys to draw the line. Fill the entire board and solve the puzzle.

Did something wrong? You can go back easily. Or just right click to delete the line wherever you want...