Could you spread the planets a little bit more out in the spritesheet when i try to use it in unity there is sometimes a little bit from the next planet of the spritsheet visible on the side!
But else its really great thanks for making the Generator! :)
I made a video showcasing it:
The planets on the left and right are the once from spritesheets you can see on the right side that they sometimes display a little bit of the the next planet in the spritesheet, the one in the middle is single png files, but when the animation resets it looks weird, else i would use this methode! The single PNG seem to have a higher image quality also btw.