Bravo!
This game is perfect! There is not one thing I would change. Excellent work!
If you do make a sequel or plan on it, you should have small bonus levels. And instead of just scrolling left or right, it should scroll up and down too, with 100's of levels. For example, a bonus level of nothing but one level of 100 of the basic balloons, nonstop.
Few questions:
Stars, stripes? What the meaning behind them all?
Is there a bonus mode after you beat all 5 modes?
Anyone know what the second to last battle badges are?
What I liked:
Menu transitions, upgrades, massive levels, completeness, statistics, multiple save files, autosave, strategy, badges, muliple playing modes, et al.
Not much really to improve. The only thing I noticed was that bombs randomly exploded in the top left corner and sometimes the enemy would not show up until all of your airstrikes and what not were gone. I think the max level should be 30, either that or have it the levels increase exponentially, that way it would take forever to get above 30 or whatever. Also, it would be cool to see what badges you unlocked while your playing but it's all cool having them at the end. Maybe a combo system?
Now to address some of the other comments:
"...but the graphics were a bit bland." - This is isn't a fashion show, this is war!
"...BUT way too hard..." - You should probably go back to playing Dora the Explorer.
"What the fuck is up with the balloon with the nose painted up?" - Strategy: The science and art of using all the forces of a nation to execute approved plans as effectively as possible during peace or war.
"I seriously dont understand how to damage them..." - Ok, you need a build atleast a Rocket Launcher, maybe a Thunder Globe and definitely a Triple Cannon and/or Auxillary Flak ASAP in the level, that way they are high levels by the time they come around. Make sure you aim at them and nothing else until they are down. FIFO, first in first out. And also, call in the Winged Bombs for sure and also the Airstrike. The Airstrike will take care of the rest of the balloons while you aim at the main balloon. If it gets more than 50% of the screen and you have other dudes bombin' you, then I'd call in Support Fire.
"...but then my bullets went through the balloons..." - You gotta aim once in awhile.
"...needs background music" - Not if you like the sweet sounds of war! WWII didn't have any BGM and we still whooped their ass."
"Not totally origonal..." - I'd have to say that it's completely origonal, just as unique as you way you spelled origonal.
"...wish for some music mate" - I'm sure you have way better music then the creator. So just crank up your favorite yellowcard song on WMP.
"This game takes too way too long time to play." - There is a game called Bounce on Newgrounds that is only 2 minutes longs. Enjoy.
"Badges - only if we have a hint on what they are can we be able to obtain them, doing a guessing game will not be easy." - All the more fun.
"The main problem I had with it, is the aiming system" - Depending on the speed of yoour bullets, aims a little bit ahead of your target.
"And the main gun is too weak in general." - I think it's just fine. Perfectly balanced.
"Is it me or are the defensive buildings worthless?" - Naw, everyone of them has their own special purpose. Some levels require certain buildings and others don't.
"The only thing that kinda nagged me was when you purchased turrets, rockets, or anything else they were positioned horizontally and it made the first two to three an easy target..." I noticed this too, but I came to solve this dilemma by placing 2 Auxillary Flak towers in front of all of them. They can swivel almost 180 degrees, shitload of health, and they only cost 8000 max. However, another thing I've noticed that if you place the maximum amount of towers on the ground and last one is a Triple Cannon, it will not fire at all.
"Support units should be Intelligent..." - That's the only thing I somewhat agree with. I think the upgrades for these should lower the randomness and increase the accuracy.
10/10 and 5/5. Good job!