Awesome game
This game is awesome, the best defense game I've ever seen!
The concept is great, a nice variety of enemies, different guns and buffs
I really got frustrated when I couldn't gun down the bigger enemies in campaign 4, shut down the game for a long time and tried again later. finally I found out the way to win.
for Campaign 4: get 1 dual machine gun, 2 sniper guns, and for the rest: dmg buffs.
upgrade the sniper's dmg until you have around 40. use the snipers to kill those pesky shield units and the tougher flyer which have a defense on the front, gun the rest down with your machinegun.
continue, after a while you can hurt the bigger ones as well with your machine gun.
For Campaign 5: again 1 dual m. gun, 1 sniper, the rest dmg buffs. after a while, when you do enough dmg to the pesky ones, you can replace the sniper with another dmg buff. the boss is a nuicance, you might want to place your turret to the back to make sure he survives long enough!
Piece a cake!
when you want to replay, use the dual again, fill the rest with dmg buffers (you still have one empty spot, fill that one later). this way you will do 10 dmg with your gun at the end lvl, enough to take down the pesky little buggers in 1 shot!
awesome game, make a new one!
10/10
5/5