I really like this game, the UI, the music and the game play are really polished. I don't have much to say :)

The game is really fun. with how you use the black ball to defend the earth.

But I think I was a little confused in the beginning, a little introduction could help.

The game is really nice. I love the fact that the projectiles slow down when you're not holding down the button. I was still able to pause after I lost a game though. Other than that it's a really good game

Lovely concept, I liked the story and theming here,  very educational
the game plays well, has nice controls, lovely graphics
The difficulty progression is decent, at some point, it was very difficult to hit all of them
The icons were pretty self-explanatory on what they do, so great job on that
Wished the earth became blacker as it loses health

And the missiles mechanic is fun to pull off

Nice concept. I like that the more you hit the more they fall.