Why not just make a temporary pixel art cover then? This isn't meant to be an attack or anything, I'm genuinely just curious. It makes it look like the rest of the game is AI generated, even though you drew everything else by hand. I guess using AI is quicker, but it can't exist at it's current state without being trained off millions of stolen art pieces. Maybe at some point AI won't have all the ethical issues it currently has, and if we get to that point I might not even mind if that kind of AI art was used as a permanent cover, but it's nowhere near that stage now.
I really hope you understand where I'm coming from. I love the game and I'm going to keep playing it, but I really wish the cover wasn't AI. And if you do go the route of making a cover yourself I'd be really excited to see it, even if it's temporary, because I find your art style really cute.