This is now fixed in the next update. The game offers a couple of nice features that add depth and breadth to what may seem on the surface to be a typical SHMUP/TD hybrid; not that a SHMUP/TD Hybrid is typical. The first is a skill tree system in place that is divided into three different sets of unlockable skills, one for your ship, towers and the main resource core that you are defe... https://in-towerxgame.com/bn-in/