It's a very sad clicker, but. HEALTH: Your health is constantly going down, by clicking on the potion, you regain some health. If your health reaches zero, it's game over. XP: If you click on the zombie you get 0.5 XP the XP, over time, can get you rewards.
Mainly me, idk. Uh, google? Oh and the song is "Don't Mine At Night".
