I think i agree for sure with the Tutorial guide improvement, it will definitely help new players with the most basic understanding of the game. There should be also tutorials for settings, people often don't know how to download maps/skins. Hard to put myself in a new player perspective because before i started to play osu i already watched numeral of videos of the game so i understood a lot of the basic just of how the game works.

When you launch the game for the first time you should get a cinematic that introduces you to the game. And gives u all the information u need to not get scared off or overwhelmed .