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SlimeStorm
SlimeStorm is a professional danmaku (bullet hell) design tool that lets you create various types of bullet patterns without writing any code. It is especially well-suited for Touhou Project-style danmaku.

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Features
Steam Workshop
Steam Cloud
Steam is learning about this software 
Requires agreement to a 3rd-party EULA
Languages:
Interface Full Audio Subtitles
English ✔
Simplified Chinese ✔

Early Access Software

Get involved with this software as it develops.

Note: This Early Access software is not complete and may or may not change further. If you are not excited to use this software in its current state, then you should wait to see if it progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“This software will have several important feature expansions in the future. Before that, we want players can experience the basic functionality of the software first. This will allow us to improve existing features based on player feedback, while also helping us understand player needs so we can better develop subsequent features.”

Approximately how long will this software be in Early Access?

“About one year.”

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

“The Early Access version includes danmaku(bullet hell) creation feature, allowing players to play or experience danmaku using the built-in danmaku player. However, it does not yet support creating full levels or complete game works. The full version is expected to add an external danmaku player based on Unity or Godot, introduce level creation features, and achieve data integration with Unity or Godot, making it possible for this software to collaborate with the Unity or Godot engines in developing danmaku games.”

What is the current state of the Early Access version?

“The Early Access version only includes the danmaku creation feature, which functions similarly to a particle effect creation tool. Players can use the built-in danmaku player to play or experience danmaku, but for now, they cannot create complete levels, design bosses, or develop full games. These features will be improved in future updates.”

Will this software be priced differently during and after Early Access?

“We plan to gradually raise the price as we ship new content and features.”

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

“We will actively collect player feedback and adjust the software’s features accordingly.
In China, discussions and feedback collection will primarily take place through the official QQ group, while in other regions, it will mainly be conducted via the Steam community.”
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This game is not yet available on Steam

Planned Release Date: Jul 31, 2026

This application will unlock in approximately 5 weeks

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About This Software

SlimeStorm is a professional danmaku (bullet hell) design tool that lets you create various types of danmaku patterns without writing any code. It is especially well-suited for Touhou Project-style danmaku. SlimeStorm supports multiple emitter types including bullets, lasers, visual effects, and enemy aircraft, and with its rich event system, you can achieve complex danmaku patterns.

Key Features

  • Graphical editing interface with a structural tree for intuitive danmaku project editing.

  • Property panel-based parameter editing for quick adjustments and batch modifications.

  • Separation of danmaku player and editor, making future expansion easier.

  • Graphical texture selection tool for fast access to sprite assets.

  • Complex danmaku logic powered by an event system.

  • Timeline editor for rapid level danmaku pattern arrangement.

  • Steam Workshop integration for quickly sharing your creations with others.

  • Built-in Player with outstanding rendering performance, easily achieving tens of thousands of bullets on screen at the same time.

  • Built-in auto-dodging AI. Creating hellishly difficult bullet patterns to torment the AI can be surprisingly fun.

Additionally, this software provides a danmaku file data interface that supports integration with game engines such as Unity and Godot, and is also compatible with .NET projects.

The Danmaku patterns of the following games were created using this editor. With this software, you can view the Danmaku files of these games and feel free to learn from them or modify them to your heart's content. (Search for the UserBarrage folder or .brg files within the game folder.)

Touhou Fantasia

Barrage Musical ~ Basic Danmaku Tutorial ~ 

東方菈菈队

东方希莲船 ~ Ultimate Fatal Octopus

Project Beril

System Requirements

    Minimum:
    • OS *: Windows 11 / 10 / 8.1 / 8 / 7 / Vista / XP (32-bit or 64-bit)
    • Processor: Intel Core 2 Duo / AMD Athlon X2
    • Memory: 1 GB RAM
    • Graphics: DirectX Graphics compatible card
    • DirectX: Version 9.0c
    • Storage: 150 MB available space
* Starting January 1st, 2024, the Steam Client will only support Windows 10 and later versions.
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