Hello! Engine author here, I'm ready to answer your questions.
If you want to support the project, please consider to either do a monthly donation via Patreon (https://www.patreon.com/mrdimas) or one-time via BuyMeACoffee (https://www.buymeacoffee.com/mrDIMAS)
Also join the Discord server, I'm looking to grow the community - https://discord.gg/xENF5Uh and check rg3d on GitHub https://github.com/rg3dengine/rg3d