I like this game! Very simple and elegant. It could be a little nerve-racking at points (get it? cus points on a line? I'll leave), but the music was a great choice to help calm the player down. The music also helped emphasize this watch-and-wait nature of the game, a style that I appreciated and that I think helps this game stand out.
Also, uh, since no one else has mentioned it yet, I wonder if this was maybe inspired by the Lineland section of Flatland?