Yeah, I probably should do something about that.
In your opinion, how about a residual shadow left behind by the pegs you place, that remain persistent for upto 5 restarts? That way you can visually see your previous placements, but not for long.
On UX front, the shadows start fainting gradually, with each restart until they are completely gone, in 5 restarts.
By the way, thank you very much for trying my game out :)