So, I tried to play Gridshot with 400 bpm metronome playing in the background. It helps me improve my clicks per sec. I don't know if this will improve yours but I
Exciting Android updates for the Metronome App by Soundbrenner - Soundbrenner
Soundbrenner: metronomo GRATIS... e non solo!
Andante Metronome - Microsoft Apps
Exciting updates on The Metronome App by Soundbrenner! - Soundbrenner