Alright, the description mentions that plasma turrets hit air and ground, yet I notice said turrets happily derping around while a huge formation of aircraft just happily passes by...
Coding or instructions fail?

Decent game, but fix those bloody ads.
Game becomes unable to continue at upgrade screen due to bad layering.

A fun game, definitely.
My only complaint is that the levels are a bit too much on the long and repetitive side.

It definitely does look awesome.
Great work here.