Is it okay if I use languages ’cause I want my game to have two languages first English (of course), and Indonesian(‘cause I’m from indonesia)

i think youll be oki as long as its playable in english

Should be fine as long as it's either optional or incorporated in a way where the player intentionally can't understand it

well it’s optional if You want to use indonesian the default is still english, I just want to add indonesian so my friends can play it