Great Game! Did you do the pixel art?
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It's nearly all MidJourney AI. I made the roads and buggies are rendering of a free 3d print model got off Thingiverse. I spent the last few months mining Midjourney for images for my job so I got pretty good at it. Just use the propt, "Pixel Art, (subject) sprites, White Background" subject is obviously what you're looking to make.