Hearts(Likes)

Hearts or called Likes are one part of the in game currency. The player can use it to obtain a new follower, upgrade the level of either the follower or Guitar Girl. By upgrading the follower levels, the hearts per second(given by the followers) will increase. By upgrading the Guitar Girl, the hearts per tap will increase. If the hearts had reached 'Z', don't worry the amount of hearts will still go up. If you see a Big Heart(Likes), tap on it, it will give you a big amount of Hearts based on the Heart per second or Heart per tap. The hearts per tap, hearts per second, Big Heart, Musical Notes, Big Musical Notes will increase the level in the current Star Event

How to use
Each section of the Guitar Girl HUD allows you to spend currency on something. Somethings, like guitars and outfits, can be unlocked once. Others, like Followers, can be levelled up to increase their Likes/sec. They can be upgraded one by one, or by factors of 10 or 100.