The tilesets also have the same problem: they have reused the Orig/Oh No exits/hatch. [...] I had plans to convert the missing Lemmini tilesets to NeoLemmix, but now I am reluctant due to these issues that everyone has mentioned.
I don't think reusing exits or hatches is a problem. I read Simon's comment not a criticism against these two objects, but rather as an explanation for his guess that the city style was ripped from another game.
Note that you convert these styles, you don't even have to add the L1 exits/hatches now, because level designers can mix styles and use the original ones from the L1 styles.
