Reminds me a bit of Jezzball (old game that shipped with windows) [0]
[0] https://playclassic.games/games/action-dos-games-online/play...
https://archive.org/details/arcade_qix
Press F3 to choose language, then use 5 to insert coins, 1 to start 1 player game. Use cursor keys to move along existing lines, use Ctrl+cursor keys to draw fast, use Alt+cursor keys to draw slowly.
https://archive.org/search.php?query=jezzball&and[]=mediatyp...