oh damn son.... you're in luck. not only are there more books, there's actually two whole separate series of books.

one where ender gets onto a space ship, and the story continues decades later (speaker, xenomorph etc) in a glaxy far far away

and whole different one, starting with ender's shadow that tells ender's game through bean's eyes, and stays on earth following bean, petra, peter and valentine etc.

ofc orson scott card is better know now as the biggest heel turn in literary history... xenomorph is probably one of the most compassionate books ever written -- by a guy who later literally made it his life's mission to campaign against LGBTQ rights. like fund raisers, marches, editorials.