An economy dominated by maintenance costsAll player’s defensive towers return 50% of their resources when destroyed or sold, so you have less to fear from your units being destroyed and can constantly change your strategy.However, all defense towers have a high maintenance cost, which means that sometimes you need to sell unwanted defense towers to reduce ongoing expenses.Constant attack and defenseThe game is not turn-based but constantly switches between day and night, but you can also pause the game and adjust your defensive line while you pause.Prepare for the final BossEach level has a different Boss, some bosses are made up of multiple structures, and you can selectively prioritize the Boss’s weaknesses to weaken it.There is no cap limit of resources, so you may want to accumulate as many resources as possible to deal with the Boss.Variety of game difficultyYou can choose different combinations of mutator factors to try new challenges, or choose randomly if it is difficult to choose.