Undying Flame

Undying Flame is a top-down wave-survival roguelite built around a living campfire. Creatures emerge from the darkness; you shoot them, collect the wood they drop and feed it to the fire. There is no health bar: the flame’s brightness, color, sound and flying embers show how it is doing. As it weakens, it shrinks, dims to red and grows quiet.

Build around the fire

Each shop offers exactly three upgrades. You can lock a card, reroll the shop or buy an upgrade and commit to that path. Seven upgrade families—Rapid Shot, Multishot, Explosives, Piercing, Turrets, Hearth and Guard—each branch into specialized upgrades and a mastery. During the Fire, you can commit to three families; reaching the Star adds a random fourth, and reaching the Void adds a random fifth. Four endless prestige tracks scale across the campaign.

Every five waves, you choose one of three relics from the Fire, Bullets, Enemies, Economy, Turrets, Light and Dark, or Cursed categories. Cursed relics can teleport bullets, create mirror shots, reshape enemies or plunge the world into darkness. Pairing relics reveals 10 named synergies, while combining a mature shop build with the right relic catalyst triggers one of six Ignitions: new effects created by your build rather than selected from a menu. You can also place Watchtowers, Forges, Shrines and Beacons, automate collection and turn kills into further kills. Builds can focus on speed, spread, explosions, piercing, turrets, sustain or defense.

Waves and the campaign

Every fifth wave has a specific test: Swarm waves challenge crowd control, Hunt waves test aim and reaction, Siege waves demand sustained damage and defense, and Trials expose a weakness in your build. Every wave 25 brings a Climax, a major combat event. After a major power spike, strong builds get room to breathe, but the darkness adapts: taking no damage during a wave sends more enemies in the next one, while getting hit lets the pressure ease back toward normal.

A campaign run starts at the campfire, then the Fire becomes the Star and the Star collapses into the Void. Your build and relics carry forward as enemies, resources, visuals and upgrade choices change. Gold and Wood become Ore and Hydrogen; in the final transformation, Antimatter replaces Ore. Your build must keep adapting as the scale and pressure shift.

Game modes

• Campaign: Play the full Fire-to-Star-to-Void run, either as a standard campaign or in one of 14 challenge campaigns with altered rules and permanent rewards.
• The Void: Grow a black hole through one of four rulesets and a 56-node upgrade tree. Instead of shooting, you use gravity to pull orbiting matter to your cursor, drag it toward the black hole and spend what it consumes. The rulesets change your priorities: preserve whole bodies, hunt valuable matter, build fragment cascades or race the black hole’s evaporation.
• Idle: Let automation fight while enemies scale to your upgrade power rather than the wave number. Experiment with relic combinations as the fire burns twice as fast.
• Daily: Play a shared seed, with one attempt each day, and compare your result on the leaderboard.

Classes and progression

Climb from Ascension A0 to A10. Ember Trials unlock the Warden, Gunslinger, Demolisher, Marksman, Pyromancer and Berserker. Further ascensions earn 12 Ascendant and Eternal mantles that change how those classes play. You can spend permanent Fire, Star and Void resources, unlock 12 fire skins and complete 30 achievements. Relic and synergy archives, a bestiary and run history record your progress.

Music and controls

The 36-track original soundtrack responds to the current phase, danger and wave intensity. An in-game music player lets you pause, skip or revisit tracks, and you can switch to a fully synthesized procedural soundtrack. The game also supports keyboard and mouse, controller, Steam Deck and touch, with automatic detection of the last input used. UI scaling, aim assist, deadzone controls, reduced effects, portrait and landscape layouts, and 28 languages are included.