Needs more balance.
I'm giving you a 6/4 cuz it's a great concept, but turrets in auto mode get stuck if a plane flies behind thier firing range, and manual mode has a problem with multiple turrets. It's a good idea though, might need a few tweaks but I like it!
A few issues to work out...
I had a problem with more than one gun being in "manual" mode, and therefore controlled by the mouse. I was trying to control one of the initial cannons and the EMP shell cannon at the same time. The regular cannon shot ust fine, in the direction I had the mouse, and its usual shell. However, the EMP was firing THE SAME round as the regular cannon and at some odd angle that seemed like about half of whatever the first gun was aimed to. As soon as I switched the EMP to "automatic", it began firing what I assume was it's intended round... a white ball. Switch it back to manual with the other cannon still on manual, and it went hay-wire again. Seems like some edge-cases need ironed out within the code.
Good game
It seems as a good beginer level game,nice to lose time.
Has potential
Unfortunately, you have some kind of bug which won't allow you to place the first turret in the tutorial, thus, I never got to play.... I'll give you a 5/10, 3/5 on good faith...
Nice
For the short amount of time it took to make, this game is very good with great coding.
The achievements and stuff were cool also