Thanks!
6595 points sounds like a lot. I never played it that long. I was too busy trying to get two more game modes in... The highscore I go turing testing and posted was 4886 and would have been higher if I wouldn't have tried clicking something in the Unity editor which accidentally dropped a piece at a bad position 😅
One of the reasons for going for a smaller scale game was actually to focus more on polishing but I don't feel I spent that much time on it and tried rushing at least one more game mode in... See the devlog for the two modes that didn't make it. Usually I try learning more things or making or improving systems and pick somewhat ambitious projects but this time I had no time and motivation to do much.
I asked on Discord about textures and textures that don't contain clear shapes are apparently allowed. Originally I had Earth as a planet in it which maybe has some shapes or at least hard transitions between land and water. I replaced it with a Mars texture with a green tint at some point but for gameplay reasons I ended up removing one piece and picked the potentially problematic Earth.
I tried a lot of different outline colors to try making them as distinct as possible. One big issue is that dark or desaturated ones are super hard to see and finding 9 distinct bright and saturated colors was quite difficult. Maybe I could have picked even better ones or did something else different. More distinct planet textures like Earth would have helped... Ah maybe I should have focused more on distinct colors for otherwise similar looking planets... Sometimes solutions are obvious but you think of them rather late.