Plain physics are the main thing to think about in this game. The physics are all wonky and i have to use trial and error.
Winning requires you to tap and drag to aim, then release to launch the skull.
The controls are a simple tap and drag to aim, release to launch. The physics are not exactly perfect, and there are no upgrades or boosters needed.
Most quick tip i found is aiming slightly above zombies often causes the skull to bounce off structures. You must use the physics to do the work for you.
Q: What are the controls? A: Tap and drag to aim, release to launch.
Q: What is the objective? A: Launch the skull to hit zombies.
Q: Are there upgrades or boosters? A: Not stated.
Q: What is the main mechanic? A: Trial and error with wonky physics.