nice video, I hope it can run smoothly on a recent pc. I guess it cannot on android
the code seems to be easy enough to use, but you could think of something like in Esenthel engine, which utilizes C++ but features some macros or whatevers for more easy coding, if you want to gather less advanced programmers too as users. it's probably worhty to check what that guy is developing and how. he said 1-2 months ago that he would not start to develop a game engine now because of the high competition (he started it 10 years ago). but I'm sure you have checked a lot of game engines available, and made your plans already...
I think the editor will require more time to develop than the engine itself. and a little crowd of testers/users.