I'm sorry, this is just a small note that I will leave as a person for whom the original language of the song is native. ^^;

The word "неважно" can be used as in the meaning of "unimportant" (example: "Это неважно в данный момент" - "It doesn't matter at the moment"), "indifferently" (Example: "Это неважно для меня" - "It doesn't matter to me") or "not good" (Example: "Я чувствую себя неважно" - "I don't feel well", "Эта работа выполнена неважно" - "This job is not done well").

However, it can be written separately ("не важно") in other cases, for example, more "not important" with some allied words.

I thought it might be an important note for the song, so...

Thank you for your attention >ω<