Thanks for the suggestion!
Good news — this is already in the works.
We're planning a new
isometric camera plus the ability to switch between cameras right inside the editor.
That lets you build true 2D-style games while still running in the 3D environment, so you keep physics, collisions and everything else the engine gives you.
In the meantime you can already get a flat 2D look with a straight-down top-down camera:
<SetCamera y="2000" pitch="90" />
(camera above the play area, looking straight down), and build your HUD / 2D-only elements from the screen-space blocks:
Label,
Image,
Button and
Joystick (x/y in pixels).
Here's an example too (thanks to theman):
2D-style demo
Stay tuned — the isometric camera will make this much easier!
— Cyberix3D Team