Ugh this makes me nostalgic for the days of Q3-era game map making and custom servers. I used to get lost in the various games Radiant variants as a teen building DM and CTF maps for my clans server.
Good luck to you. Having worked in this space for around 10 years I can say it's nearly impossible to arouse anyone's interest since the market is so totally saturated.
For a new engine to take on it needs do something else nobody else is doing so that it's got that elusive USP.
Getting visibility, SEO hacking etc is more important than the product itself.
Looks awesome. Anything been made with this?