: Is this the same app used for the upscaled monsters shapes mod?
No idea about that. I upscaled a screenshot. I don't know what they used for that mod. But I suppose you could try it. I don't know if upscayle can do batch processing, so you might need to do one sprite at a time, a few seconds for each one.
But I tried these:
And here's another screenshot. Here Upscayl had trouble with the shotgun and muzzle flash, it sharpened the blurry pixels, making them stand out more.
I suppose it could be used to improve sprites, it might reduce the amount of work needed, but it would still require some manual detailing.
My intention doesn't go much further than playing with new technology and making pictures that look good to me.