Just played your game... It's fun and well-programmed, but need improvements for sure. Rated it 5 Stars on Play Store to help it get more attention. However, here's my detailed and frank review:
As of now: Amazing game play, perfect controls, challenging and fun to play.
By the way, there is one bug: Highscores do not get submitted! please check.
Improvements: Ball could be slightly bigger, after every 10 points, create another ball just for extra fun and continuity - Imagine someone trying to preserve 5 balls in the circle, that would be awesome, compared to one ball for 5x times more time - that may get boring, right?
As of now: Took me a long time to understand the controls ! - I got a hang of it, but it ain't easy. Always make sure to have the easiest control so that the users get challenged by the game alone, not how to play the game.
Improvements: I suggest having "Point towards Touch.X, Touch.Y" controls. Let it follow the finger and it will be amazing! Trust me.
Third Mode: (Levels)
As of now: That's like a hidden mode! I would not have found it, if I wasn't to assess your game! It's good, but that's really a different type of game.
Suggestion: I suggest making a whole new game with that concept. OR. keep the three modes in a line to choose from. You can have a look at my game that I recently posted (Stickman Cricket League) to get an idea on how to make things "look" much more appealing and simple to use, because that helps a lot.
Apart from that, I also suggest having a "Share on Facebook" button, which will help you gain more downloads (because you shouldn't expect an Android user to randomly bump into your game, it took me a lot of scrolling to reach it after searching exactly your game title!). But, you will need to work on the game-improvements first so that you have returning customers, not the one-time audience or those 1-star lovers.
Hope this would help.. Feel free to ask me for any help
I'd also appreciate if you can have a look and review my game as well !
Oh, and about the Video Trailer... 10/10 for that, just epic!