Played for a week and make several purchase my conclusion this is one of the most predatory game i've seen and try to make my life miserable in summary: 1. Balls got insane wide angle vs narrow stage, harder to shoot 2. Balls tries its best to break combo and fall down screen 3. Spawn mechanic fill any gaps, making combo impossible 4. Enemy hp scaled by insane amount that need hundreds hits to kill 5. F2P gains is a joke, u need continous purchase to scale dmg to hp 6. Stage 12 beats 99% user