You are not ready for this.
Just dont smash your phone against a wall after a few tries.
You can do it.
Just stay calm and UnJump!
[Made in Kyrgyzstan]
More serious description:
Ok, so theres a Ball which bounces all the time and its always moving forward. You need to tap the screen to make it bounce downwards to control its movement and help yourself avoid spikes.
And collect coins, my dearest UnJumper :)