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Chthonian TD
Co-op action roguelite × tower defense. Run and shoot as 1–4 players swap between combat and mining layers, build towers, survive 7 waves including a boss, then push into Endless - unlock permanent stat upgrades with crystals.

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Features
Single-player
Online Co-op
Family Sharing
Steam is learning about this game 
Languages:
Interface Full Audio Subtitles
English ✔

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: Q1 2026

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About This Game

Chthonian TD

is a dark, stylized co-op blend of action roguelite and tower defense. You don’t just place towers—you run, shoot, and swap between a combat platform above and a mining layer below. Spend a shared wallet wisely, hold the line through six escalating waves and a boss (Wave 7), then push your luck in Endless. Runs are quick (about 10–15 minutes), tense, and built for “one more try” with friends.

Play your role. Four classes make the team click: the Fighter carves space, the Miner fuels the economy, the Engineer shapes lanes and keeps defenses running, and the Medic stabilizes the push with heals and clutch revives. Everyone contributes, and your money pool is shared—coordination beats raw stats.

Build on the move. Crossbows handle single targets; cannons blast groups. Each now comes in three archetypes—Basic, Crystal, and Void—so you can tailor lanes to enemy comps:

  • Crystal adds Chain Shot and can grant bonus resources on kill.

  • Void adds Armor Penetration and a brief Micro-Stun on hit—great for elites and boss pushes.
    All towers gain Tower XP during the run and level 1→3 for extra range (with visual bullet scaling), making builds feel stronger without slowing the pace.

Know your targets. Enemies come in categories—normal, anti-AOE, anti-projectile—so you’ll want a mix of projectile and AOE damage to stay ahead.

Progress beyond a single run. After each game you earn crystals to invest in permanent base stat boosts (damage, move speed, attack speed, attack range, max health). Meta upgrades now also nudge your next attempt with higher starting resources/XP and slightly juicier pick-ups, so each new run begins a touch stronger.

Maps that stay fresh. Each run seeds a new crystal-lit mine with two distinct feels: Dungeon (tighter rooms) for scrappy holds and Wide (open fields) for flexible setups. Swap layers instantly to plug leaks or scoop resources; readability stays high via class colors, outlines and clear VFX. No friendly fire—this is about teamwork, not team griefing.

Art style. Stylized low-poly dark fantasy: chunky silhouettes, hand-crafted forms and cozy dungeon lighting. Stone, runes and glowing hexagonal crystals create a clean, readable battlefield that supports fast decisions.

What’s in Early Access

  • 1–4 player online co-op

  • Two modes (Dungeon and Wide), six waves + boss (Wave 7), optional Endless afterward

  • Core towers: Crossbow, Cannon plus their elemental variants (Basic / Crystal / Void)

    • Crystal: Chain Shot + chance of resource drops on kill

    • Void: Armor Penetration + Micro-Stun on hit

  • Tower XP & Levels (1→3): towers gain XP from damage/kills; range scales per level

  • Run-based upgrades (XP picks) and a tight shared-wallet economy

  • Meta progression (crystals): permanent base stat boosts, improved run starts (higher starting resources/XP) and slightly increased pick-up yields

  • Seed-generated maps in a crystal mine biome

  • Simple in-game library to look up classes, towers, enemies, perks and resources

  • English only

Vision

This is a small, honest Early Access build focused on the core loop. If enough players enjoy it, the plan is to expand with more towers and enemy variants, additional maps/biomes, deeper meta progression and new class options. For now, it’s all about tight, replayable co-op that respects your time:

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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