That was an awesome game! I am surprised that it is not more popular. I guess its biggest downsides are that it's mostly just the same enemies over and over. That still doesn't stop it from being tons of fun as you get to ravage your way through an army of colorful enemies! The blue bombs being dropped were kind of cool, I liked how you didn't have to worry about attacking the people on the ground as much. The music is also great.
I've actually somewhat followed the Apache series throughout the years. It truly is underrated. I really like how you just keep your finger on the button to keep it going, because you're going to need it. In fact, all games like this should have that feature. The sounds are quite authentic, especially with the helicopter blades.