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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I've asked many other game developers about their opinion on publishing source code, since this rarely happens. Opinions vary, although the consensus is that there is no strong reason to either do it or not do it. Therefore, this is a bit of an experiment. I hope it facilitates modding, and maybe I can merge some mods into the base game. The code is released under the Apache 2.0 with Commons Clause license, meaning anyone is free to do what they want with the code except for selling it.
Did you talk to the creators of Shapez.io? They sell on Steam and also released their source code. Heck, they even have a cool little feature where you can autobuild it online without having to setup the environment at all! https://shapez.io/ https://github.com/tobspr/shapez.io