I agree. This was a really fun-chill. Further development would be welcomed.
cool things might be having some simple stats for each planet, like how long a day is on the planet, how many days a planet takes to complete a full orbit around the star, how many days/years a planet has existed for, population of each planet, asteroids with elliptical orbits. Then maybe having solar systems you've completed connect is some way
Yeah, I don't know. graphical assets? Honestly, I really just loved the music paired with chill solar-system building.
If you're looking to get over game-dev's block, I would recommend taking a day off, spending some time thinking about if you're still invested in the game. If you're just looking for more good ideas, I'd listen to The_Other_Sean. I've never been interested by stats, but if there was a way to interlace planet's orbits (in such a way that they don't crash), or detail individual planets, like painting or adding cities, I think that would be fun. Since it's a chill solar system game, focusing on planets design, or more cosmic disasters, could be fun angles to explore.