"mini" tileset is probably the right term, not so much for the number of tiles but for their content. Looking at the titular grass shows the issue: it’s much closer in size to JJ1 Jungrock than JJ2 Carrotus, and JJ1 is displayed at a much lower resolution than JJ2 is usually played at. Jazz and other sprites look overly large against it, and the wall texture is sufficiently noticeable that it’s hard not to make the screen look repetitive—which, again, wouldn’t be an issue at a lower resolution. This would be a great tileset for a different game, because despite their size, the images really do look very nice. The treetops are my favorite things here, both the bushy-yet-plausibly-flat ones and the gnarly spiky foreground ones, though again the trunks are too small for this game. The background hill palette could use some more thought, it blends in too much with the foreground.