These are some ideas for worlds in yume 2kki i want to see one day.
Tattoo world
Oil refinery
Gym (no not a dojo, the ones people use for EXERCISE)
LIDAR world (yknow like level 6 from backrooms escape together)
salt pan (think deadvlei in namibia if you wanna make it less empty)
unicycle world
a map inspired by crisis city from sonic 06
nuclear wasteland map (think the fallout games)
cruise ship
UV light world
X-ray world
areas in the following styles: zx spectrum, pc engine/turbografx16 and sega megadrive
i want to add a new effect too