Filling the world with color

I'm at my dad's house for one week so I decided to make at least 5 games in that time period.

The third game is about filling the level with paint.

Source code :  https://www.puzzlescript.net/play.html?p=43ccd08299f1697e4adf0cfca0f6011c

Controls :
- Arrow keys to move
- X to select
- Z to undo, R to restart