Once again, I realy enjoyed your game ! I find it quite hard to hold more than 200 steps (pressing "play round" 4 times), mostly because at some point my defenses start to bubble so much they hit the cores, but I'm sure you have here a very good concept, thanks a lot :)
Thank you very much!
A nice addition would be adding a "BOMB" that would be expensive, but would clear an area the player selects.
Now the strategy is utilizing the fact you can place pulsars anywhere, even outside of the influence area, so you have to keep finding an empty space somewhere over the entire map.