Here are the basics, the red borders your building zones, these can range from turrets, buffers, and resource gatherers. The green borders a turret, these can be upgraded at the end of each wave. They also have a set amount of armor before being totaled. During a wave, you choose which turret to attack which enemy, which is bordered in blue. Your base is bordered in purple and will take damage after all of your buildings are destroyed. Destroyed building zones will have a black marking on them.
After each wave, a merchant may come by where you can purchase materials, hear gossip, and trade with other nations. You may also choose to buy or upgrade your current buildings. Those that have been completely destroyed must be turned back into scrap.
This is the shop screen. Right now, you may only buy these items. As you complete more waves, more will be available. Some buildings can only be crafted by combining current buildings.
After you complete the first wave, I shall tell you more about masteries.
