So about gui, in order to fit different screen sizes the scale changes. Downscaling produces a good result while upscaling is bad.

Currently the gui graphics are imported to fit 1920x1080 space. Should I import them at a larger size to avoid upscaling??

I'm not quite familiar with screen resolutions and stuff or how I should proceed with resolution settings. So far my re scaling proc calculates how much it has to zoom in/out to fit a certain amount of tiles. So what do I need to know so to not mess up with different resolutions/sizes??