About This Demo

The demo opens up 4 ways to play. Standard Survival plus the Hungry Dark, Dim Light, and Ember Vow challenge runs. Wave cap is 50. A real taste of the upgrade tree, relic system, and the wave-by-wave panic the campfire creates. Idle mode, the other 11 challenges, Daily seeds, the codex, and the cosmic phases beyond the fire are in the full game.

When the fire dies, so do you.

Undying Flame is a top-down wave-survival rogue-lite built around a single idea: keep the campfire burning. Creatures march out of the darkness toward your fire. Shoot them, feed the flame with the wood they drop, and survive long enough to see what the fire becomes.

There is no health bar. The fire tells you everything. A healthy flame is bright, warm, and loud, with embers flying and logs crackling. A dying one shrinks, dims to red, and goes quiet. You learn to read it the way you'd read a real fire. Watch the color. Listen to the crackle. Feed it before it's too late.

Two ways to play, one fire to keep alive

Survival. Click to shoot. Hover to collect wood. Press F to feed the flame. Fast, tense, skill-based.

Idle. Everything automates. You spend coins. The fire burns twice as fast to keep the pressure on. Best for experimenting with absurd relic combinations while enemies scale to your upgrade power instead of wave number.

A deep run, every run

16 shop upgrades across bullets, fire, automation, structures, and defense, plus 4 prestige tracks that repeat forever and climb in cost.

6 unlockable classes: Warden, Gunslinger, Demolisher, Marksman, Pyromancer, Berserker. Each one rewrites how shots, fire, and pacing feel.

4 placeable structures: Watchtower, Forge, Shrine, and Beacon. Each one reshapes how your run plays.

8 enemy types including stalking Brutes that pause at the dark's edge before charging, Necros that revive nearby corpses, and Shielders that eat your first bullet.

Boss waves and Deep Night. The dark closes in on you.

Random events: merchants, storms, ancient blessings, rituals. Choose what you're willing to burn.

90 relics across 7 categories, plus 10 hidden synergies

Every 5 waves, pick 1 of 3. Fire, Bullets, Enemies, Economy, Turrets, Light/Dark, and a Cursed category where bullets teleport, mirror images fire behind you, and the screen goes fully black with auto-aiming plasma. Pair the right two and a synergy fires: brand-new effect, no warning, just a name on screen that wasn't there before. Stacks interact. Runs diverge wildly. You will not see the same build twice.

15 challenges, 11 permanent perks

Beat challenges like Pacifist (fire kills only), Dead Man's Bargain (all upgrades maxed, fire capped at 10%), or Ashen Vow (turrets only) and earn perks that carry into every future run. Your progress sticks.

The fire grows

Every wave you survive, the flame gets a little larger. Early on it's imperceptible. Later, the fire is pushing the darkness back on its own. Survive long enough, and the fire consumes the screen, and the game becomes something else entirely.

Features at a glance

Endless wave survival with two full game modes and a 15-challenge system.

90 relics, 10 synergy unlocks, 16 shop upgrades, 4 prestige tracks, 6 classes, 4 structures, 8 enemy types.

Procedural visuals and handmade audio with optional fully synthesized audio.

24 Steam achievements, cloud saves, Steam Trading Cards.

Full controller and keyboard/mouse support.

Built for Windows and Linux.