If you allow users to export their worlds to 3D model files/scenes this would be the number one application for quickly creating worlds for VR worlds such as VRChat and Neos. I would buy this app on the spot for double the price if I knew I could export the world to Neos so that I can actually be in the world while in VR.
Please consider this and be sure to advertise it! There's a huge market demand right now for tools to quickly and easily make worlds for VR.