Great puzzle game! There's a lot of potential for interesting levels and possible additional interactions with the links. The aesthetic is great, especially the glow of the dots on the environment. Especially loved the last level, which at first looked simple but required a bit of thought to solve.
My biggest feedback is around controls. I think the game could have been made both simpler and mobile friendly with click+drag instead of arrow keys and toggling. And a small thing, but when the red circle gets turned off, a shadow of where it use to be could be used to indicate where it will reappear; I lost the last level because my positioning was slightly off!
Great game, would love to see it turned into a fuller game with more levels!