BreakFree puzzle game - need feedback

I am currently trying to develop a game using Unity3d. So far I have Android and iOS versions, but also want this to work for VR. I can really use any feedback because I am trying to improve this game.

So far I just opened a YouTube channel where I am going through the game levels, you can see what it looks like there.

The actual game is available on Google Play, search for BreakFree puzzle game.

Please let me know if you can think of any way to improve this game (if I end up using your idea I'll give you a credit in the About section). Any advice is welcome!

Aww... no one...

I am now thinking about adding promo codes that will add funds (in-game coins) and allow to purchase more power ups. Just for fun.