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Fallen Lean playtest
by Younes
Dr. Square's plague took everything Lean loved. Take up your father's sword in a dark 2D action platformer: carve through the infected, survive four deadly worlds and face the doctor himself. Then build your own levels with a full editor and play them online with friends.
Anyone with a Steam account can join, and it's free.
- Access
- Instant
- On playtest since
- Oct 14, 2025
- Released
- Sep 9, 2024
- Developer
- Younes
- Platforms
- Windows
- Players
- Co-op, Multiplayer, Online co-op, Single-player
- Languages
- Arabic, Bulgarian, Czech, Danish and 27 more
How to join the Fallen Lean playtest
- Open the game's Steam page with the Join playtest button. Sign in to Steam if it asks.
- Use the Fallen Lean playtest signup there. You're in straight away, with nothing to pay.
- The playtest shows up in your Steam library, ready to install and play.
New to playtests? How Steam playtests work
How AI is used
After two years of solo development, I decided to enlist AI tools to help produce some of the game’s assets, as I was exhausted from the long journey
The developer's own words, from Steam.
About Fallen Lean
Deep beneath the city, Dr. Square created a merciless plague and unleashed it with his own hand. The virus crept into every street, and people became the dead.
Lean lost his mother, his father and the one he loved. Now he carries his father's sword, and one promise: Dr. Square will pay.
- Fast, skill-based combat. Move, aim, dodge and strike through hordes of the infected.
- Your weapons, your style. Swords, guns and supernatural powers you unlock as you grow stronger.
- Use the world. Recoil, timing and environmental damage turn every fight into a puzzle.
After a devastating defeat, a mysterious hero carries Lean into a parallel realm. Four deadly stages hold the Gate Tokens he needs to return home.
- Sun-scorched forests, frozen peaks, haunted portals and burning castles.
- Side missions, secrets and hidden paths in every stage.
- Upgrades and abilities that shape the way Lean fights.
Colossal bosses, brutal enemies and deadly traps stand between Lean and his revenge. Learn their patterns, or fall like everyone before you.
Fallen Lean comes with a full level editor. Build the level you always wanted to play.
- Build anything. Tiles, blocks, props, enemies and traps.
- Add effects. Change the whole look of a level in one click: neon, VHS, blueprint, sketch, fog, retro pixels and more.
- Light your world. Place lamps and glowing lights that bring every room to life.
- Your content. Import your own images and music.
- Script everything. Attach behaviours to any object, and switch gravity and physics on or off.
- Your own player. Tune run speed, acceleration, jump power, gravity and dash.
- Online co-op. Invite your friends through a Steam lobby and play together.
- Create together. Build and script the same level with a friend, live.
- Share your levels. Publish your creations and discover levels made by other players.
- A dark, story-driven 2D action platformer
- Four worlds full of side missions, secrets and Gate Tokens
- Brutal bosses, including Dr. Square himself
- A full level editor with effects, lights and scripting
- Online co-op, co-creation and level sharing
- Fully translated interface and subtitles
- Free demo available
Lean's story is waiting. The portal is open.
Play the free demo, then step into the full adventure.
From the game's Steam page.
