Here is my progress so far: https://denischera.com/reactor_defence2/index.html
1. Upgrade turrets and reactor with click
2. "Space" for money
Now I want ot implement hp/damage system, so every next state of turret will deal more damage. But I am little bit stack. More info here: https://forum.defold.com/t/need-some-help-with-damage-hp-approach/11273