One Of Them made it all the way to alpha testing using a custom version of the dim3 engine from Klink! Software. Dim3 however hasn't been updated in several years, and therefore has limited compatibility with current generation hardware / consoles. For this reason a decision has been made to move the project over to Unity.
So far, the change of engine has drastically improved the game graphically. Check out initial screenshots of the Unity build below.
The dim3 demo is now available for macOS 10.13. If you'd like to try it out, or collaborate on the project, or give me a job, get in touch with me
Unity physics and terrain test map: