Shelter Fall vs 回线：BACKTRACE

The world has ended. A handful of survivors look to you for leadership. Can you keep them alive? Shelter Fall is a post-apocalyptic survival strategy game where you manage a small group of survivors, build and upgrade your shelter, research technologies, and defend against nightly waves of hostile creatures. Every run is a tense 20-day roguelike journey where one wrong decision can mean the end. SURVIVE THE WASTELAND Manage five critical resources — Food, Materials, Ammo, Power, and Morale — to keep your survivors alive. Assign them to scavenge, build, research, or stand guard. Balance short-term needs against long-term survival as threats escalate with each passing day. BUILD YOUR SHELTER Construct 10 unique buildings including Greenhouses, Med Bays, Workshops, Watchtowers, Barracks, Laboratories, and more. Each building provides vital bonuses — from food production and healing to crafting and defense boosts. Plan your layout carefully; resources are scarce. DEFEND THE NIGHT When darkness falls, hostile creatures attack. Place and upgrade 5 types of defenses — Barricades, Traps, Turrets, Generators, and Walls — each upgradeable to level 5, and choose which flank every new one holds. Then take command in real time: three tactical orders a night let you rally your defenders for a burst of damage, emergency-patch the wall that is about to break, or drop a flare into the thick of the horde, and a Command Center earns you extra orders. Hold the line against Walkers, Runners, Tanks, Brutes and the Boss enemies that stalk the late nights. RESEARCH 25 TECHNOLOGIES Unlock powerful upgrades through a deep tech tree. From Efficient Gathering and Advanced Medicine to Auto Turrets, Night Vision, Explosive Traps, and the desperate Last Stand protocol — every technology can tip the balance between survival and extinction. FACE 30+ RANDOM EVENTS Each day brings unexpected challenges and opportunities. Encounter wandering survivors, discover supply caches, face moral dilemmas, weather dangerous storms, and make choices that shape your colony's fate. No two runs play out the same. SCOUT THE MAP Send survivors to explore surrounding zones on a procedural map. Discover resource caches, encounter dangers, find new survivors, and uncover the secrets of what happened to the world. FOUR DIFFICULTY LEVELS Start with Easy (6 survivors) to learn the ropes, tackle Normal (5) or Hard (3) for a real challenge, or brave Apocalypse mode (2 survivors) for the ultimate test. Unlock 14 achievements as you master each difficulty. META-PROGRESSION Even when your shelter falls, progress carries forward. Unlock permanent upgrades and bonuses that make future runs slightly easier — but never easy. FEATURES AT A GLANCE • Roguelike 20-day survival runs with permadeath tension • Real-time night defense scenes powered by SpriteKit • 10 buildable structures with unique strategic benefits • 5 defense types, each upgradeable to level 5 • 25 researchable technologies • 30+ narrative events with meaningful choices • 4 difficulty levels from Easy to Apocalypse • 14 achievements to unlock • Procedural map exploration • Survivor recruitment and management • Meta-progression between runs • Atmospheric sound design and original music • Haptic feedback for immersive gameplay • Night Commands — rally, patch and flare in real time • A post-mortem after every run, plus Play Patterns stats • Free to play, with one optional purchase to remove ads Download Shelter Fall and find out if you have what it takes to lead the last survivors through the apocalypse.

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。