Doraemon references are pretty common in JP pop culture tho. It's an old cultural icon about everyone at least knows of over there, analogous to Mickey Mouse and Donald Duck in the West. Probably a kids' entertainement standby or something.This game has a surprisingly high amount of Japan Manga references (BlackJack , One Piece .vv)
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Doraemon loves "dorayaki" ( a type of Japan's doughnut ) >>> MC refers to Doraemon manga, about a robot cat comes from future .
And Black Jack is a Tezuka classic at least recognisable even to us gaijin piggus so, yeah.