# taisei-project/taisei

A free and open-source Touhou Project fangame

Repository: https://github.com/taisei-project/taisei
Canonical: https://ross.abutalabs.com/products/taisei
Homepage: https://taisei-project.org/
Language: C
License: NOASSERTION
License Family: other
Topics: sdl, c, game, opengl, touhou, danmaku, shmup, glsl
Last push: 2026-08-26T15:31:51+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 72, longevity 100
- inputs: {"age_days": 5805, "days_push": 7, "days_rel": 31, "gap_med": 152.0, "n_releases_24m": 5}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1606, forks 127 (observed 2026-08-28T04:05:10.491556+00:00)

## What it is
Taisei Project is a free and open-source Touhou Project fangame: an original top-down vertical-scrolling bullet hell (danmaku) shoot 'em up set in the Touhou world. It is written in C11 using SDL3 with an OpenGL renderer and runs on Windows, Linux, macOS, and browsers via WebGL.

## Use cases
- play a free open-source Touhou-style bullet hell game
- play a danmaku shmup on Linux, Windows, or macOS
- play a shoot 'em up in the browser via WebGL
- find an original Touhou fangame with its own story and music
- study a C11 game codebase using SDL3 and OpenGL
- run a bullet hell game on Nintendo Switch homebrew

## When to choose
- you want a polished, free, cross-platform Touhou-style bullet hell shooter
- you want to play a shmup directly in a WebGL-capable browser
- you want an original danmaku game that doesn't require knowledge of Touhou
- you want a real-world C/SDL/OpenGL game codebase to learn from

## When to avoid
- you want an exact clone or remake of a specific Touhou installment
- you need a game engine or library rather than a complete game
- you need official console support (Switch build is experimental homebrew)

## Facets
- artifact type: application
- maturity: stable
- function: game, graphics, gui
- domain: gaming-tools, cross-platform
- platform: windows, browser, cross-platform
- tags: touhou, bullet-hell, danmaku, shmup, fangame, sdl3, opengl, webgl, game-development, linux, macos

## Member repositories
- taisei-project/taisei (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:10.491556+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:52:15.287175+00:00, confidence not recorded.
  - readme: https://github.com/taisei-project/taisei (fetched 2026-08-28T04:05:10.491556+00:00, sha ec91adbab1c2)
  - homepage: https://taisei-project.org/ (fetched 2026-08-29T11:23:50.416790+00:00, sha 7bea529afbeb)
- Data as of 2026-08-30T08:39:29.467469+00:00.