No, RPG in a Box is a standalone project made with Godot, created in the same way that a game would be made.
As a long-term goal I hope to include some sort of simple online cooperative mode. I haven't decided on anything specific yet, but it would likely consist of someone controlling a secondary player character in another person's game.
It isn't at this time, as free movement is outside the scope of my core vision for RPG in a Box. However, according to how things go, it may potentially end up being a long-term goal for post-v1.0. Because I intentionally designed the engine with a grid-based nature in mind, reworking the functionality that is both directly and indirectly related to movement would be a major effort.
It won't be increasing in the short term, however I may potentially look into increasing the limit in the future. This would most likely come after the upgrade to Godot 4.0, during which I will be taking the opportunity to rework and optimize the Voxel Editor to better handle higher voxel counts.
There's still a lot left to implement, so I'd recommend checking out my Trello board first. The "Roadmap" card contains a very high-level list of planned features, while the "To Do" and "Ideas/Planned" lists contain more granular tasks and functionality. If you're unable to find any cards that mention the feature in question, feel free to suggest it in the "suggestions" channel on the Discord server!
I wanted to create a simple language that could be tightly integrated into RPG in a Box. As Bauxite is still being developed, it will be continually growing to add more functionality and capabilities. At this time I don't have any plans to support other languages. It's similar to some other languages, like Lua, and is very easy to pick up if you have knowledge of basic programming concepts.
Yes! You are free to distribute and sell your games, with no strings attached (i.e. no royalties, licensing, or fees). Although it isn't required, crediting the use of RPG in a Box is always very much appreciated!
No, I don't currently have any plans for it to be open source.