I'm testing on a Mac with a trackpad. And the issue was that when I click on a turret and move the red marker across the moon area, it would be stuck an a location and I'm not able to move it. I've tried the game again now, and it seems to be OK with no issues. It could be that the game was detecting clicks as I moved my fingers across the trackpad and the turret got place correctly, but I thought that it was stuck. Maybe adding support for keyboard movements as well would make placements easier for me, or maybe I should've just used a mouse :P