Tower Defense

This is a simple demo, which is currently solving some logical problems on the values:)

The game is a tower defense game in the 9*9 square. Monsters (currently the ball) will attack from the center of all directions. Your goal is to protect the "center" as long as possible. You can choose to deploy remote or melee units in the surrounding squares. For each unit, you can choose three attributes for it. It can be attack power, range of attack, or attack speed, or health, defense, and even cost recovery speed. You can also upgrade these attributes to continuously increase your unit strength. These operations need to be used costs, and the cost will slowly grow over time. The monster's offense is divided into waves. Each wave of monsters will be different. Ordinary monsters are black, and colorful monsters will have special abilities. In the end, there will be a super boss, I wish you good luck ~