Very cool game in my opinion.
But i think it needs a little more depth.
* Upgradable weapons + more use for money
* Maybe some researches
* Mision types - example: defend the airship while its filling the gas.
Really nice game and I would like to see upgrades for towers and other stuff.
+ As I understod - it is possible to build tower (I built radar) outside interface. But Im not sure
+Need way to deselect tower building, need restart option and menu in overall
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