Ah, I see. Don't know how the technical part work :) Anyway,awesome job on the bits so far. For my eyes, I struggle with the 32x32 details in recent years, even with glasses. XD
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Most retro games tend to just upscale the entire game without any interpolation, such as x2 or x3 pixels per pixel. Additionally you can add an interlacing and blur effect on the screen to make it look smoother. I did it in Surgevania