Freedom251 › Game Engine Software
Usagi Engine
What Usagi Engine is
Usagi Engine is free, open-source software for making 2D pixel-art games with Lua 5.5. It targets Linux, macOS, Windows, and the web, and one export command packages projects for those platforms. During development, a watcher applies saved code and asset changes without discarding game state. The built-in pause menu includes sound and music volume controls, fullscreen switching, and per-game keyboard and gamepad remapping. A single function saves and loads game state as a Lua table. Defaults use 320x180 resolution, a 16x16 sprite grid, and one sprites.png texture file. The maker positions it for rapid pixel-art prototypes, newcomers to game programming, Pico-8 users facing token limits, and people wanting something simpler than Love2D. Usagi has no visual scripting, multiplayer tools, mobile export, or console export, and is not intended for medium-to-large polished games. Users supply their own sound, sprite, and music tools.
Who it suits
Usagi suits beginners, rapid pixel-art prototyping, and developers comfortable with Lua 5.5. It fits projects targeting Linux, macOS, Windows, or web rather than mobile, VR, or console releases.
What it does well
- Free and open-source
- Exports to four listed targets
- Live reload preserves game state
- Built-in pause and remapping menu
- Lua table save and load function
What to know first
- No mobile or console export
- No visual scripting or multiplayer tools
- Not intended for large polished games
- Users provide asset-creation tools
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Usagi Engine | Free software; dedicated to the public domain | Free |
As usagiengine.com lists them, read 9 Oct 2026. The maker's own page has the final word.
Verdict
Usagi Engine keeps 2D pixel-game development focused on Lua and a small set of desktop and web targets. Its free, open-source model is appealing for prototypes, while the missing exports and tools define its boundaries.
Facts from Usagi Engine's own pages
- Asset tools
- Users bring their own sound effects, sprite editor, and music tools. · usagiengine.com, 9 Oct 2026
- Built-in pause menu
- The built-in pause menu includes sound and music volume, fullscreen toggle, and per-game keyboard and gamepad remapping. · usagiengine.com, 9 Oct 2026
- Console export
- No · usagiengine.com, 24 Sept 2026
- Default constraints
- Usagi uses a 320x180 default resolution, a 16x16 default sprite grid, and one sprites.png texture file. · usagiengine.com, 9 Oct 2026
- Developer support
- The site directs users to open an issue for feedback, feature requests, and bugs, and links to Discord and Reddit communities. · usagiengine.com, 9 Oct 2026
- Export
- A single export command packages games for Linux, macOS, Windows, and the web. · usagiengine.com, 9 Oct 2026
- Free plan
- Yes · usagiengine.com, 24 Sept 2026
- Installer integrity
- The installer verifies the downloaded release with a SHA-256 checksum. · usagiengine.com, 9 Oct 2026
- Live reload
- The development command watches code and assets and applies saved changes without losing game state. · usagiengine.com, 9 Oct 2026
- Maker
- Usagi is made by Brett Chalupa. · usagiengine.com, 9 Oct 2026
- Mobile export
- No · usagiengine.com, 24 Sept 2026
- Multiplayer tools
- No · usagiengine.com, 24 Sept 2026
- Notable limits
- Usagi does not target mobile or VR and is not built for medium-to-large polished games. · usagiengine.com, 9 Oct 2026
- Purpose
- Usagi is a 2D game engine for making pixel art games in Lua 5.5. · usagiengine.com, 9 Oct 2026
- Save data
- One function saves and loads game state as a Lua table. · usagiengine.com, 9 Oct 2026
- Scripting languages
- Lua 5.5 · usagiengine.com, 24 Sept 2026
- Source code model
- open_source · usagiengine.com, 24 Sept 2026
- Target platforms
- Linux,macOS,Windows,web · usagiengine.com, 24 Sept 2026
- Visual scripting
- No · usagiengine.com, 24 Sept 2026
- Who it is for
- The maker describes it as suited to rapid pixel-art prototyping, people new to game programming, Pico-8 users who hit the token limit, and people seeking something simpler than Love2D. · usagiengine.com, 9 Oct 2026
Where Usagi Engine stands on Freedom251
- Game Engine Software#47 of 92