0.7.7 Version Update

· Two new maps have been added, a easy level [buffer] and a hard level [valve]

· A new defense tower has been added: [UAV platform], which can dispatch drones to any location on the battlefield for support; [X Bomb], a bomb that detonates immediately and can eliminate multiple enemies concentrated together.

· In the endless mode of Survivor, [Ancient Stele] will appear, which can be occupied by heroes and unlocked with special technologies. Currently, 6 new technologies can be unlocked. Please explore and discover the specific effects in the game;

· Balance adjustment has reduced the duration of the control effect on the boss to 1/3; Nowadays, defense towers have different construction cooling times, and large defense towers have longer construction cooling times than small defense towers; Heroes and mechs can now be placed directly on traps, bridges, and ice surfaces, and traps can also be placed on bridges and ice surfaces.

· Fixed some bugs