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Good game !
There is a bug when you do "pause". "Main menu" and "Back" buttons become visible. If you click on the "pause" button again, the "Back" button is still visible. And then in the menu between two waves, if you click on the "Back" button, it is no more possible to click on other buttons.
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Cool shooter. 5/5. Bottom/left corner: kind of interesting strategic location the scientists picked up to build their turret. :)