Mine’s here 
is 2D
https://play.google.com/store/apps/details?id=com.denysalmaral.CrabbyBall&hl=en
I just tried yours but the FPS is low in a Samsumg S2, and can’t manage well to play it well.
Check this forum thread for some notes about my development and and the latest screenshot: Crabby Ball [beta] - 2D Android game - Game Development - Unreal Engine Forums
For reducing size I followed this answer: Why are android file sizes so big? - Mobile - Unreal Engine Forums