I've been using Seedream 4.0 via NightCafe.
Example below. Told it to "scale the image up" and set the output to 16:9 (2560x1440), input image was 1024x640. Seems to do a decent job. Not sure how it will do with lower res start images or pixel art. I'll mess with it later and see if I can figure anything out. I'm not a fan of normal scaling either, at least for pixel art.
Edit: So, this is the best I can get... I downloaded a 600x400 Monkey Island Demo screenshot and played around with some prompts. The best results came from "Upscale the start image. Maintain colors, style, pixel clarity and sharpness. No image softening". The result is below. Still better "recreating" using a start image than free upscaling software on lower res images in my opinion. Not perfect...but not terrible. Even the paid scalers on NightCafe suck at pixel art.
On a side note. I wanted a clear image of the condor and egg from FF7, I like how it turned out too. Created using Seedream 4 and a screenshot from the game on PC.
DOS, Win9x, General "Retro" Enthusiast. Professional Tinkerer. Technology Hobbyist. Expert at Nothing! Build, Create, Repair, Repeat!
This Old Man's Builds, Projects, and Other Retro Goodness: https://theclassicgeek.blogspot.com/