Fair enough. In retrospect I admit I really should have phrased my review a bit better. What I should have said is that I know of AI that can get close-enough to a pixelated style to create some very impressive images with some minor alterations. And that's my bad, my apologies. I've also softened my views on Retro Diffusion since I first wrote that review as the style has grown on me even if I don't use it. It does do something that is fairly unique in the AI field (at least as far as I know) and for that it is a great service that I hope to see further refined. If you feel that it's worth the cost, then don't let me dissuade you. By all means use it, I won't judge. I'm sure Mr. Astropulse would appreciate your business and perhaps use the money to make better models for us in the future.
Still, I didn't want you to go away empty-handed so I've got two quick examples below that I think can illustrate that other AIs can make some very pretty sprite art. Please note that I did shrink these down to 128x128 pixels in my (20-year-old) version of Photoshop using 'nearest neighbor' resampling to make them look more convincing as pixel art as the original images did have some odd artifacting. Still, I think it should help illustrate what these two can do for some very convincing sprite art with the software. With a few alterations these could be indistinguishable from the genuine article.
Anyways, best of luck to you. Cheers!
Knight Portrait: Created in Bing AI using a custom pixel art prompt I created.
Man with Barrel: created with Chat GPT requesting a picture of a man struggling to lift a barrel in a sprite art style.