I loved this game. Added it to my collection. There's something so soothing about the atmosphere of the whole thing, but it also feels compelling and makes me want to keep playing it, even when losing, which doesn't feel as frustrating as most games. For a relatively straightforward puzzle game, the basic mechanics are very unique and really make me think; I feel like there's a lot of room for complex strategy here, which is surprising given how simplistic the rules are. That's great for a puzzle game.
The whole thing just looks beautiful. I guess the backgrounds and such could be a little more varied and intricate, but the simplicity of the whole aesthetic fits the mood pretty well. The space setting makes the lights really stand out; you really feel like you're manipulating stars or something while you play. That means you implemented the theme really well, even though there aren't a ton of special light effects or whatever. The sounds do add somewhat to the "Lightshow" feel, full of sparkles and swelling ambience.
Not sure if you employed the "Only One" limitation in any way, but a lot of people didn't. Still, for how simplistic this game is, I really enjoyed it better than most games in this jam, and I'm definitely going to revisit it. Bravo!