I have some mixed feelings here. Let's go through the categories to show you why :)
Gameplay. To be honest, it's not for me. Like- I like chill games and sandboxes, but I feel there needs to be something more gameplay-wise here.
Graphics. Actually really cool. Making procedural art look cool is not an easy task, but you made it. Planets look neat, comet looked great! The sky looked... well, like a starry sky on a cloudless night, but in this jam it's a compliment :)
Audio. The background music fits, but there's not much else. Maybe a "ding" sound when you add a star into a constelation?
Theme. Well... it's stargazing! I don't want to repeat the "gameplay" part, but it would be cool, if you did more with the theme.
And this is why I have mixed feelings. Technical aspects are really cool. The gameplay needs work. Keep it up, man!