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Heartlines
Heartlines: A choice-driven FPS. Under an angel's threat, you have 10 days to kill the demon hiding among 5 friends. Who is the victim? With 10+ endings, every choice leads to salvation or hell. Will you obey the light or find the truth?

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Features
Single-player
Family Sharing
Steam is learning about this game 
Languages:
Interface Full Audio Subtitles
English ✔ ✔ ✔
Turkish ✔ ✔
Simplified Chinese ✔ ✔

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 decided to release it as Early Access because I need time and feedback to add the 10+ endings to my game, and also, I'm planning to go beyond the main progression, like adding more secret endings or changing a few of them. I'm also planning to make every choice more meaningful.”

Approximately how long will this game be in Early Access?

“This game will be in Early Access for 3-5 months. The Early Access version will include all 10+ endings. After that, I will just focus on adding more details.”

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

“I'm planning to finish the core storyline and implement multiple endings that are directly affected by the choices you make throughout the game. And also I'm planning to do better performance improvements. I intend for the final version to feature the concept of 'choice matters' expanded to its fullest potential.”

What is the current state of the Early Access version?

“At this version, Day 1, Day 2 and Day 3 is playable, it's about 45 minutes of gameplay, on Day 1 you will get to know about characters and in Day2/Day 3 story will be progress normally. ”

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

“Full version will be a little higher than the Early Access price.”

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

“Everyone is welcome to join my Discord server where you'll be able to communicate directly with me. I will listen to your opinions and use them to shape the game, reducing flaws and striving to make it as close to flawless as possible.”
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This game is not yet available on Steam

Planned Release Date: Jun 10, 2026

This game plans to unlock in approximately 4 months

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About This Game

Heartlines is an FPS game where you control a character, and it heavily focuses on choices within dialogues. The main point of the game is to approach characters and talk to them. Your dialogue choices will influence future conversations and the overall direction of the game.

10 DAYS: THE SHADOW OF A LIAR

"Kill him, or I will drag you all to Hell."

It started with a dream. A being of blinding light, a voice that shook your very soul. It gave you a holy command... or so it claimed: "One of your five friends has been possessed by the Devil. Find them. Eliminate them within ten days, or I will cast every single one of you into the eternal fire."

But light can be the cruelest deceiver. As you roam the streets and visit the homes of those you once trusted, a terrifying question begins to haunt you: Is this "Angel" a savior, or the very monster it claims to hunt? Are you a hero, or just a pawn in a divine execution?

A Story Driven by Paranoia and Blood:

  • Trust is a Death Sentence: Walk the streets, enter their homes, and look into their eyes. These aren't just characters; they are people you thought you knew. Every conversation is a minefield of secrets, lies, and hidden agendas.

  • The Divine Threat: You aren't fighting for glory; you are fighting for your soul. The "Angel" watches your every move, threatening you with damnation if you hesitate. But can you kill a friend based on the word of a shadow?

  • Dialogue-Heavy FPS Mystery: Use your eyes and your ears before you use your weapon. In this psychological FPS, a misinterpreted sentence can be more fatal than a bullet.

10+ UNIQUE ENDINGS: YOUR FATE, YOUR CONSEQUENCES

The truth is a shattered mirror, and how you piece it together is entirely up to you. With more than 10 distinct endings, every choice you make ripples through the final outcome.

  • Will you unmask the "Angel" and break the cycle of lies?

  • Will you sacrifice an innocent to save your own skin?

  • Will you find the true possessed soul, or will you become the very evil you were told to destroy?

When the tenth day ends, the sun will rise on a world changed forever. The question is: will you be alive to see it?

Mature Content Description

The developers describe the content like this:

This game contains depictions of characters in revealing clothing (such as short outfits) and scenes where characters are seen in their underwear while resting or sleeping. While the game does not feature explicit sexual acts or graphic nudity, players will encounter suggestive themes and mild fanservice.

System Requirements

    Minimum:
    • OS: Windows 10/11
    • Processor: Intel i3-9100
    • Graphics: NVIDIA GTX 1660 Super
    • DirectX: Version 11
    • Storage: 10 GB available space
    Recommended:
    • OS: Windows 10/11
    • Processor: Intel i5-9400
    • Graphics: NVIDIA RTX 2060 Super
    • DirectX: Version 12
    • Storage: 15 GB available space
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