I will leave some feedback, if it seemed harsh, disregard it:
1. The 3D model does not serve any purpose. It just causes more scrolling across tabs since because of it they have less space. Omit it.
2. Make sure after purchasing an upgrade, the update appears right away, not after changing to another tab and returning.
3. Orders are broken, need to be fixed.
4. The progress is too slow with little happening. Especially the Research points.
5. What do different machines help you achieve? Is it like you should constantly upgrade the machine with minimum production rate? If yes, then leave it be.
6. Numbers don't make sense. How can I produce 234 cars per min when my machinery can paint 8 cars per min?