The indie game that’s been floating around as a promising demo since earlier this year is now out in full. Iron Abyss, a sci-fi horror mecha dungeon crawler from developer OTR HVN (with co-development from YG3), hit digital storefronts today for Windows PC, macOS, and Linux. The price: $9.99. A free demo remains available for anyone wanting a taste before buying.
In case you missed the pre-launch chatter, Iron Abyss puts you in command of a three-pilot android crew — ASSAULT, MEDIC, and SYSTEMS — as they descend 30 floors into a sealed, post-apocalyptic structure. The game’s hook is its “sensor-rendered” visual style: you see the world through the mech’s amber wireframe reconstruction, never the actual environment. That aesthetic draws heavily from Evangelion, Alien, Blade Runner, and Soviet New Wave cinema, according to the developers, who’ve been transparent about their influences from the start.
Mechanically, it’s a turn-based tactics game using a CTB (Conditional Turn-Based) system similar to Final Fantasy X, where your action speed affects your next turn’s position. There’s no row protection — any pilot can be targeted — and a sanity mechanic that gradually wears down your crew with each hit or loss, eventually allowing a high-risk “BREAKDOWN” move or forcing a resource-burning “GREY MATTER CLEANSE” to reset. It’s a modest but clever tension system that gives the horror label some real weight.
The full release expands the earlier demo (which covered three procedural floors, one boss, and one story floor) into a complete 30-floor run with eight to nine new cinematic story sections that were previously teased. The demo itself received a final polish pass recently — improved audio with four licensed tracks from Scott Buckley, bug fixes for save persistence, reworked cutscenes, and cleaner UI — so it now accurately represents the final product.
OTR HVN isn’t a household name, but the studio has been quietly building a reputation for atmospheric, narrative-driven indies. The collaboration with YG3 on this title suggests a slightly larger production than their previous work, though the $9.99 price point keeps it firmly in the “affordable curiosity” category. Playtime is estimated at around three to five hours per full run, which feels reasonable for the price.
If you’re interested, the full game and the free demo are both available at the same Itch.io page: otrhvn.itch.io/iron-abyss. The game officially launched today, August 11, so there’s no more waiting.