Casualties: Unknown Review: A Brutal Descent That Peaks Early

What it is

Casualties: Unknown is a 2D cave-exploration survival sim from developer Orsoniks and publisher Oro Interactive. It left its long demo phase and launched in full on Steam on 9 November 2026, for Windows, single-player only. You are a test subject dropped beneath the surface of a hostile alien planet to recover cargo for your captors. Thousands went down before you. None came back.

The full game has ten main layers, a shorter eleventh, an optional bonus ending, three playable characters, an endless mode and more than 300 items.

How it plays

The hook is the body. Limbs, blood and heart are simulated separately, and the game never lets you forget it. A cut bleeds until you bandage it. Leave a wound dirty and it gets infected. Lose too much blood and you black out mid-climb. Lose the limb entirely and you are shopping for one of three tiers of prosthesis, the best of which beats flesh and bone.

On top of that, your mood sinks as fear and despair set in, and you craft from whatever you scavenge. Preparation matters more than reflexes, and that is the right call. This is a game about what you packed, not how fast you click.

The highs

Few survival games make an injury feel like a story. Here a bad fall on layer three is still shaping your decisions two layers later, and the treatment system is genuinely tense rather than a menu chore. Adjustable loot and danger settings mean the punishment is a choice, and the 97 percent positive rating from the first 767 Steam reviews shows how well that lands with its audience.

The lows

The demo was too generous for the game's own good. It covered the first five layers, half a million people played it, and a recurring complaint in launch-week player reviews is that the back half adds little in the way of new mechanics. Several players describe the later layers as a sprint to the finish rather than an escalation. Cave generation is plain, you can only save after clearing a layer, and the two extra characters are locked behind finishing a run with the previous one.

A fair warning too: the store page lists depression, dismemberment, drug use and self-harm. This is not a game for the squeamish.

Price and who it is for

On Steam it costs 21.99 euros in the eurozone, or 18.69 euros with the 15 percent launch discount, which runs until 23 November. The demo stays free on Steam, so there is no reason to buy blind. If the first five layers grab you, the full game is more of exactly that, with real endings. If you already put twenty hours into the demo, wait for a deeper sale.

A note on method: we have not played the full release. This verdict draws on the published launch content and on launch-week player and press reports.

Verdict

One of the most distinctive survival systems of the year, wrapped around a descent that shows its best cards early. Brilliant for newcomers, thinner for demo veterans.

Score: 8/10

Image: KQuhen / CC BY-SA 4.0, source: https://commons.wikimedia.org/wiki/File:Batu_Caves_Dark_Cave_Interior_2015.jpg