Casualties: Unknown launches on Steam on November 9, 2026, publisher Oro Interactive announced, for $22.99 with a 15% launch discount. It’s been on my list since its demo became one of the odder Steam hits of the year.
More than 500,000 people have played that demo since it came out in April, and it has ranked among Steam’s 10 most played demos daily. The game sits at 360,000 wishlists, and it’s a single-player game for PC.
Orsoniks, the developer, is one person. They design it, program it, compose the music and draw the art. Their earlier work was mostly small free games, and Casualties: Unknown started as a personal project that found its audience through free early alpha builds on itch.io. Oro Interactive is the label behind Super Battle Golf and Roadside Research.
You play a test subject lowered into the caves of a hostile alien planet to fetch cargo your captors lost. Thousands went down before you, and none came back. It’s a 2D survival sim, and your body is the main danger. Limbs, blood and heart are each simulated, so a deep cut keeps bleeding until you bandage it, a dirty wound turns infected, and enough blood loss knocks you out. Plants in the caves patch you up, and scavenged parts become tools.
The demo covers the first five layers. The full game doubles the descent, with 10 main layers and a shorter 11th, plus multiple endings and an optional bonus one. It adds three playable characters with their own stats and three tiers of prosthetic limbs for when the caves take an arm or a leg. There’s crafting too, plus character traits and more than 300 items. Loot and danger settings are adjustable.
Before you download it, know that the mind is simulated too, and the store page warns of depression, violence, dismemberment, drug use and self-harm.
A solo developer taking a free itch.io alpha to half a million demo players is the reason I keep this list. If you haven’t tried it, the demo is still on Steam, and you can wishlist the full game before November 9.
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