In the Top you will see three gray boxes

On every 10 kills one of the boxes will be ready to upgrade 
just click them when they are not gray 

More information
StatusReleased
PlatformsHTML5
Rating
Rated 1.0 out of 5 stars
(1 total ratings)
Authorharli74
Made withUnity
Tags2D, Idle, Singleplayer

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