Hi,
when you are not sure about the platform target, make sure you always:
- Support ALL screensize, use the Canvas Scaler component for this ( in mode scale with screen size, with 0.5 as the match value, it's a good base)
- Support both mouse and touch input
- Make sure you use regular shaders and/or have a way to switch between mobile friendly option or full blown hard core gamer pc spec
- Always test both on pc and mobile to avoid detecting issues too late and not be able to address it straight away
- profile often to make sure your specs are fine and within the norm.
if you don't do the above, you will be out of luck if late in the development you decide to go for mobile. however, if you solely develop for mobile, going back to pc is ok, if mouse was taken in consideration.
so yes, starting with mobile dev in mind is a safer approach than the opposite.
Bye,
Jean