Thank you for your comment.
If you want something that upscales pixels in fine detail rather than simply upscaling, this is the way to go. English is also supported.
ぴくせる すけゐらぁ
https://irokaru.github.io/pixel-scaler/
ぴくせる すけゐらぁ - ののの茶屋 BOOTH支店 - BOOTH
https://nononotyaya.booth.pm/items/2517679
I am considering adopting it in a program I have created, but I have no plans to add that functionality at this time.
