I was given early access to this too, and it's evolved a TON since those early days. The platform is fast, simple and easy to use.
I love the new version of the text editor and its auto-generated transcript which is amazingly accurate. I also love the ability to set the size of the text outline, a request I put in early on. The developer is very responsive, another bonus compared to other platforms I've used. Finally, the rendered video output is quite small, yet the video quality remains high.
The only drawback I see is that it only renders in 1920x1080. Square or 16x9 are placed inside that container with blank space on the top and bottom. Given it's intended use, that makes sense and I'm working that into my video workflow.
Thank you for early access to this tool, and I look forward to seeing how you develop it further over time.