On June 17th I was at Lua-in-Moscow meetup with a talk on how to quickly make a 3D game in Defold.
Here is the end result, feel free to study the source code.
Play online: https://lerg.github.io/TankVsMeteors/
GitHub: https://github.com/Lerg/TankVsMeteors
Controls: WASD, Left/Right arrows, SPACE, Q or gamepad with sticks and shoulder buttons.