The first tileset I drew for C3 winter 2021. It's a futuristic area, with the main decoration being large screens that can display numerous different neon symbols.
The main issue here is the palette usage. Please consider either having the neon elements overwrite the berry palettes or the equivalent space on palettes 6/7, it seems like it can in total be condensed into 2 palette rows, probably with no real interference other than the main foreground being on palette 2. An example optimization could be allowing color 22 to be used, then the neon colors currently on palettes 5 and 6 could be combined into palette 2, and use all of it. Then, the neon elements currently on 7 could be placed in one of the remaining berry palettes.
While not a reason for rejection, I noticed that there are a few empty spaces in your ExGFX file, I wouldn't expect people to need the space but it may be nice if you're able to concentrate it on one side of the file.
That said, it looks great, I look forward to seeing the resubmission!