Thank you for the interest you give to Open-Volt!
I'm still working on the project, but way less than several months ago.
From the last time I've given an update about it, I've focused on technical stuff, and didn't give visibility about it because I think it's not the most interesting thing to let people read there.
I've dropped using Unity engine, Godot is now used instead. And the fact Open-Volt is engine-less just made things a lot easier to do as the port has been done in one week.
Here are two comparative screenshots of the 2 game engines:
I definitely love using Godot engine, way more than Unity, because the API is cleaner and more permissive, exactly what was needed for the project.
Godot is still a young game engine and not perfect though, I've hit my head against a lot of walls, but I look forward for the 4.0 that looks very promising, that's why I'm not involved on Open-Volt as much as at the beginning.
Btw, I was planning to create an entry on itch.io, and write some true devlogs to show the project is not dead. This kind of website is, in my opinion, more suited for the current state of Open-Volt. By this, I mean, Open-Volt is somewhere between the proof of concept and the alpha stage, so, expect more heavy block of texts about the progress than releases. That's why itch.io is well-suited for that purpose.
My philosophy about the development of the project is, as long as I don't have a solid code base and I don't feel comfortable using the SDK myself, I won't focus on gameplay features. The golden milestone that needs to be reached is this easy-to-use SDK. Once done, this will give a true boost to the project, and a lot more interesting stuff to show.
About a possible collaboration, this idea has already came to my mind. Though not impossible, it would be subject to a deep reflection, as RVGL and Open-Volt don't use the same technologies, which is, in my opinion, the main barrier. This doesn't mean this barrier could not be broken, but, let's be honest, it won't be easy. Another question is how to make Open-Volt and RVGL intereact? One uses the legacy code, the other was started from scratch, the model is different. Directly hooking some components of Open-Volt would be challenging. However, what comes to my mind that is possible is to use Open-Volt as a dedicated server for RVGL, as long as a data contract is set up. But I guess the dedicated server is already in the roadmap of the RVGL team and will do a way better job than an external tool.
Hope this post helped to give some visiblity and have answered to most of your questions.
Anyway, thank you so much for your support