Cosmoknights by Hannah Templer

SPACE LESBIANS!!! Holy WOW this blew me away! What an ingenious blend of sci-fi and medieval knights. In a universe where knights joust in mech suits for the princess's favor and marry her off to a suitor, Pan joins a resistance to give the princesses their lives back into their own hands. Full of heart, cool gadgets, and a diverse range of well-written characters, this was the queer space opera I've been searching for.