Serious Head

Prepare to defend yourself. Purchase defensive structures, recharge your energy and fight off waves of monsters. Kill bosses and upgrade weapons. Complete the final day and close the portals!
准备好自我防卫。购买防御性建筑，补充能量并击退一波波怪物。击败首领并升级武器。完成最后一天并关闭传送门！