[MMM]

Japanese (in Romanji):
ya

Japanese:
や

English:
emphatic (!)

Part of Speech:
copula

Region (where this slang/phrase is used):
Kansai

Demographic (who would use this slang/phrase):
younger people If anything, や is used more emphatically by older people, but it is safe to say it is used by pretty much all Kansai folks.

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You've got all kinds of Hokkaido slang on the front page, so if started talking about Heppe with someone not from Hokkaido, they are not going to know what I am talking about. There is no context in the lists, so I am seeing all these words I never heard before, and then have to click to see they are only used in a small part of Japan. I like learning dialect words, too, but that organization is a little dangerous.

So is putting all the words in romaji from the start. 9 times out of 10 non-experts (or at least people who can't read hiragana) should not be using these words.

Just my thoughts. You have put a lot of effort in, but those points I think needed to be mentioned.