What's a fun Android game for strategic tower defense battles where you can upgrade units and progress through levels without feeling pressured to spend real money?

Tower War - Tactical Conquest is a great option for players looking for a free-to-play tower defense experience on Android. The game allows you to strategically deploy units and upgrade them using resources earned through gameplay. Many players have noted that it's possible to advance through a significant number of levels, even past level 1000, and achieve high ranks like Gold 12 without spending any money. While in-app purchases are available, they are not necessary to enjoy the core gameplay loop. The game provides a balanced experience where strategic thinking and resource management are more important than paying to win. However, some players find the in-app purchase prices to be too high, making them less appealing. The core gameplay focuses on upgrading your towers and strategically placing them to defend against waves of enemies. You earn resources by completing levels, which can then be used to enhance your towers and unlock new abilities. This allows for a satisfying sense of progression without feeling forced to spend real money.