The goal is to get as many "Bone Power" as possible, you start with 1 Bone Power per click and 0 Bone Power per Second, you can buy upgrades from the shop to increase your Bones per Second and Bones per Click which lead to more effective ways to getting more Bone Power, as long as you have enough bone power, if you don't, it won't add to your Bones per Click or Bones per Second.
The song is Megalovania by Toby Fox. The original image is from Undertale. Credit to several Sans Clicker games for the idea.
