Alien Fortress vs 回线：BACKTRACE

Build a combat vehicle, recruit specialist gunners, and break into a secret fortress overrun by alien monsters. Alien Fortress blends bullet-hell shooting, roguelite exploration, tower defense, real-time strategy and base management. Every mission asks you to adapt your chassis, weapons and operators to the battlefield, then punch through the enemy with firepower and smart positioning. BUILD YOUR OWN COMBAT VEHICLE Mix and match more than 10 distinctive mecha chassis with over 20 weapon operators. Each weapon has its own range, firing rhythm and tactical role. Deploy multiple vehicles together and turn a small squad into a wall of fire. EXPLORE, LOOT AND GROW Collect weapon parts, relics and equipment to upgrade your vehicles and operators. Eight companion pets provide different bonuses, giving every squad its own path to power. 45 STORY STAGES Fight through mines, serpent caves, alien motherships, hives, aerial fortresses, dune strongholds, reactors and the Death Star. Defeat massive bosses and uncover a plan to harvest Earth’s civilization. MORE WAYS TO PLAY • Ladder Maze — randomized dungeon runs • Outpost — endless defense • Hive War and Dune Fortress — build-and-defend RTS battles • Treasure Raiders — high-difficulty challenges • Endless Swarm — mow down waves of alien creatures • Whack-a-Mole — a quick arcade diversion Drive, deploy, upgrade and improvise. Break out of every trap and lead your bounty hunters deeper into the alien fortress.

子弹不会在去程造成伤害。真正的攻击，发生在它沿原轨迹归来时。 BACKTRACE / 回线是一款围绕“返程弹道”构筑的俯视角动作 roguelite。你只有六枚不会消耗的弹丸：把它们射向墙面，利用反弹布置未来的杀伤线；引诱敌人进入轨迹；在正确时机召回；最后赶回旧射击点，接住归来的弹丸并维持战斗节奏。 核心特色： - 独特的返程伤害机制：去程布线，返程穿透敌群； - 六枚永久弹丸：每次发射都同时创造弹道与必须返回的锚点； - 主动召回、相位冲刺、反弹、标记和接弹组成高密度战术循环； - 五波完整单局、四类敌人和多阶段 Boss“收债人”； - 九项围绕返程、反弹和接弹设计的局内升级； - 为 iPhone 与 iPad 横屏设计的双虚拟摇杆和快捷按钮； - 离线单机、无广告、无应用内购买； - 降低闪光、关闭震动、瞄准辅助和色觉符号等辅助选项。 先决定子弹将如何回来，再决定自己要去哪里。