OK, it has an interesting idea.
But it was not what I expected, it was slow and very repetitive, always the same meteors just again and again... Upgrades are dull and I don't like the music.
To make it more realistic, meteors should burst in flames in ozone layer and shrink a little. And also, meteors from bottom and up don't give you time to do anything.
And I suggest putting everything to HIGH, because I have a slow computer and it worked perfectly.