Fast-paced co-op action roguelite × tower defense. Fight escalating waves, risk resources in a dangerous mine, defeat the boss - then see how long you survive in Endless.

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Coming Soon To Early Access

The developers of this game intend to release as a work in progress, developing with the feedback of players.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“I want to get real player feedback on the core co-op loop (two-layer arenas, shared economy, four classes) and on the meta progression system before I lock in larger systems like more classes, towers and maps. Early Access lets me iterate quickly based on what players actually enjoy.”

Approximately how long will this game be in Early Access?

“My current plan is to keep Chthonian TD in Early Access for roughly 6–12 months. This may change depending on feedback, how much content I add, and how many players are actively interested.”

How is the full version planned to differ from the Early Access version?

“The full version is planned to expand the existing meta progression (more crystal upgrades and unlocks), add more enemy types, additional maps/biomes, more classes and towers, and general polish and quality-of-life improvements.”

What is the current state of the Early Access version?

“The core loop is playable: 1–4 player online co-op on PC (keyboard & mouse), Dungeon and Wide modes, six regular waves that introduce new enemy types, a Wave 7 boss and an optional Endless mode after the boss. There are four base towers plus one class tower per class, run-based XP upgrades, and a basic meta progression system where you earn crystals after a run and spend them on base stats (damage, move speed, attack speed, attack range and max health). There is also a simple in-game library where you can look up classes, towers, enemies, perks and resources. English only; no controller support or in-game chat yet.”

Will the game be priced differently during and after Early Access?

“Yes. The Early Access price is lower. I plan to increase the price slightly when the game leaves Early Access to reflect the additional content and features added over time.”

How are you planning on involving the Community in your development process?

“I’ll be using Steam discussions (and player reviews) to gather feedback on balance, new content, meta progression and quality-of-life requests. I plan to adjust enemy difficulty, towers, classes and future features based on what active players report and what keeps co-op runs fun.”
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This game is not yet available on Steam

Planned Release Date: Mar 20, 2026

This game plans to unlock in approximately 2 weeks

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About This Game

Chthonian TD

A co-op action roguelite x tower defense game for 1–4 players.

Defend against escalating waves.
Descend into a crystal mine to grow stronger.
Face a powerful enemy that shifts the pace of the run.
If you survive - push into optional Endless Mode.

Short runs. Constant pressure. No autopilot.

You’re Always in the Fight

This is not passive tower defense.

You move, aim, dodge, revive teammates and react under pressure while your defenses buy you time.

Towers strengthen your defense - player decisions still drive the run.

Every Run Evolves

Level-ups offer upgrade cards that reshape your build.

Some make you safer.
Some reward greed.
Some push the run toward instability.

Your build changes how the game feels.
No two runs play the same.

Power Has a Price

Stay above and hold the line.

Or descend into the mine to accelerate your growth.

Mining fuels stronger builds - but leaving at the wrong time can cost the run.

Greed is always a decision.

Four Roles. One Team.

Fighter - controls space and absorbs pressure
Miner - accelerates economy and scaling
Engineer - stabilizes lanes and strengthens defenses
Medic - prevents collapse when mistakes happen

XP is shared. Builds diverge. Survival is collective.

Early Access Features

  • 1–4 player online co-op

  • ~15 minute structured runs

  • Two map styles with distinct pacing

  • A powerful mid-run enemy encounter

  • Optional Endless Mode

  • Card-based progression each run

  • Persistent upgrades between runs

  • No friendly fire

Vision

Chthonian TD is built around one idea:

Relentless action, meaningful choices, and co-op that actually demands teamwork.

Fight above. Mine below. Survive together.

System Requirements

    Minimum:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10/11
    • Processor: 5th Generation Intel i5 CPU or equivalent
    • Memory: 4 MB RAM
    • Graphics: GTX 670 or higher
    • Storage: 2 MB available space
    Recommended:
    • Requires a 64-bit processor and operating system
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