Do you mean a small part of the image, the image in less pixels, or the image in more pixels?

If you post the original resolution image generated for the submission (160 x 144) as a screen shot, it will look very tiny and not work well for displaying your work on your itch page. Upscale means scaling up the entire image (4X is a good factor) but making sure it's nearest neighbour or hard pixels depending on your software. Make sense?

yes, thanks