Glad you like it!
The tile button makes it so that the edges of the image loop around, so you can tile them which is pretty convenient for games and stuff. I felt like 3000x3000 pixels was already quite a lot, especially for pixel art, but I guess there is no real reason to have the limit there.
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thank you so much for responding to me. i really like your generator and im already using it for phone and laptop backgrounds. i love your work and the various space generators you have, i love the pixel design and they look so incredibly pretty to me. i hope you have a wonderful day and im looking forward to the next generator or game or anything you make really.