Sure thing. Please take all with a grain of salt. I'm just a single datapoint, I rarely represent the whole of humanity.
No bugs found. And I did try to find them; I tried to select the bottom weapons as the bonus counted on the endlevel screen, and stuff like that. Seems rock solid, as far as I can tell. The only thing that wasn't expected was that I could scroll the level chooser up/down while it faded away. Not even remotely a bug, but unexpected behaviour.
It was... fine? I mean, if you wanted me to pay $1 or suffer through many ads I wouldn't play it. That doesn't mean it's bad, just that I'm probably not your target audience.
As for the gameplay, I found it too simple. That said, I've played these kinds of games before and I don't know how to make them harder. I found the stones a fun addition. The weapons were unexpected, and the only one I really like was the rocket. The colorball seemed so very limited and the bomb was just ok. The rocket was fun, but I found it disappointing that it didn't at least blow away a couple of stones. Same for the bomb.
Because of reasons I played it with no sound, which worked fine for me. At some point I turned on sound on my mobile, and found that I disliked the music so much that I muted the phone again. First I tried to turn off the music and only have sound effects, but couldn't find that. That disappointed me a little.
The graphics are fine. They look professional and playful and like lots of other games. That's probably the correct way to go. Personally I find the look a bit boring, I've seen it so much. I prefer graphics that are more minimalistic in their base look. This doesn't mean they are dry, they can still be full of effects. Three games as examples:
Infinitode 2 - Tower Defense - Apps on Google Play
Endless simplistic tower defense with plenty of features and developer mode
play.google.com
As for the game animations, they are great. The balls push each other around slightly and it looks absolutely awesome.
As for the UI animations, I find them a bit tiresome. I tend to quickly get frustrated if I have to look at UI animations. But you did something great here: I can interact even though the animation happens - that is great! Two examples that come to mind: When the level selector arrow moves to next level I can still tap the new level before the arrow arrives. And at the endlevel dialog I can tap the arrow button instantly. I suppose I get in a flow and just want to get on with the playing, and waiting for animations is just like a forced break. Two things I thought about: The level selector tap target felt small. Often I found myself tapping rapidly a dozen times to hit it. And the endlevel three stars that falls, I'd like if they all fell at the same time, with something like 0,2 secs between them. So their fall animations overlapped a lot.
It took way too long for me to realize that it was no use to save the weapons between levels. I'm naturally inclined to thinking "this is simple, better save the weapons for a difficult level". One way to maybe solve that would be to give each unused weapon a bonus too, at end of level. And as part of that do something with the icon to even more clear (than the background) show that they are "empty".
I think the tap target for the pause might be a bit small. A couple of times when I tried to pause, I launched a ball instead.
And the text for level 61 isn't in English, but you probably already knew that.
I have a question for you: Is the color of the balls given to me completely random (picked from the colors in the playfield, obviously), or do you manipulate the order and selection somehow?
All in all: Very nice looking, very professional. Not my favorite genre, but clearly made me play 60 levels so it apparently hooked me just fine.
And it's also very apparent how skilled you are, very impressive!
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