has anyone ever played Heli Attack 3? because its been made way before this game, the concept is the same, but the gameplay, graphics, and guns are a lot better. this game, 3/5.
I've been bouncing off of that accelerator for quite a while now. the powerups and enemies don't go away after hitting them. the images just disapeear.
@ cpt obv: you're probably playing in the challenges that don't allow lvl 5 upgrades. when you select an iron or heroic challenge, it tells you in the description what the lvl restrictions are for the level. those restrictions apply to tower upgrades in-game as well as to the skill tree.
the railgun is a disappointment. I was expecting an overpowered, piercing gun. I get a machine gun instead. the warping bullets aren't as fun as you might think. have you ever even SEEN a real railgun firing?
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It should save now. I just broke your game when I fixed a bug. Sorry. :(