sticky line was one of the original planned features. We also envisioned a "speed up splat" where you could place a colored splat zone that would boost your ball. More features that didn't make it are magnetic (attracting and repelling) obstacles, areas that color the ball to allow passage through certain areas, slow down zones, and "no paint zones" where it's not allowed to draw anything. Wanted to use that mostly around the goal, and maybe to prevent avoiding intended challenges. Unfortunately these features didn't make it in time.