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Where am I going wrong here ?

SetWindowSize( 256, 342, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
SetVirtualResolution( 256, 342 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts
DrawBox(10, 10, 246, 332, 100, 100, 100, 100, 1)
GetImage(1, 0, 0, 256, 342)
CreateSprite(1, 1)
SetSpriteSize(1, 256, 342)
SetSpritePosition(1, 0, 0)
SaveImage(1,"box.png")

do
Print( ScreenFPS() )
Sync()

loop

I can save this box.png here like so - but the resulting image is 574 x 768, not 256 x 342 in size ?
(It's just a red box with a bit of a gap around the edges, almost full window size)

This works ok for me. Your code will put the box.png in the c:/Users/yourid/BlahBlah directory.
Add this code before you save the box
SetRawWritePath(GetReadPath())

Then your image will be written to your media folder. Make sure there is no box.png in your media folder before hand

or use : 'SetRawWritePath ( '/' ) to save to the same directory as your EXE.

from the GetImage help file:


So, perhaps, ResizeImage() before saving, or modify GetImage() width & height to account for virtual resolution/device resolution scaling.