Pattern:Script is an open-source HTML5 game engine based on PuzzleScript. Try it out here!
The manual has only been partially updated from PuzzleScript, as the project targets game devs with prior knowledge of PuzzleScript. A list of the new features (and planned features) is available on the project's wiki – you should start there to learn what Pattern:Script can do for you!
If you want to contribute to the project, I suggest starting with reading these pages:
The MIT License (MIT)
Copyright (c) 2013 increpare for the original PuzzleScript software, (c) 2021-2022 ClementSparrow for the modifications of PuzzleScript and new Pattern:Script features
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.