Wow, this is an awesome app, But there are some details.
For example, the controls are kind of annoying :/ I have an Galaxy S4 and the joysticks are really tiny (configured as medium) Also, they are too close and half the time you ended rotating the camera or moving the adjacent joystick. Please add an option to make them 2x bigger, and also will be better if you separate them.
Also the cammera its not really easy to controll, when you make a translation and then a rotation, the pivot of the cammera is reseted. And if you want to see from above, you cant because the ceiling, maybe if you delete the polygons from above.
and for the last, consider that the app could be load in multiple devices with lots of resolutions, in hi res screens, the images will pixelate, consider using hi res images (the icons)
Thanks for sharing.