Since this is another expanded Kirby subgame, the credits should be somewhere in the options menu (past experience taught me to expect to find the credits there).
Developers: HAL Laboratory / Vanpool
Shinya Kumazaki (General Director)
Tadashi Kawai (Planning Director)
Yumi Todo (Director)
Hiroshi Ohnishi (Programming Director)
Source: hallab . co .jp/sp/company/blog/detail/003472/
Found the credits. Source: https: // www.youtube . com/watch?v=A0OlLQuGAAU (starts 2:14:00)
(Localization staff omitted.)
GENERAL DIRECTOR
Shinya Kumazaki
DIRECTORS
Tadashi Kawai
Yumi Todo
Jun Taniguchi
LEAD BATTLE DESIGN
Yuki Watanabe
BATTLE DESIGN
Takehiko Kubokawa
Tatsuro Kusano
UI PLANNING
Jideock Kim
Kazunori Morisawa
PROGRAMMING DIRECTOR
Hiroshi Onishi
LEAD PROGRAMMMONG
Yohei Fukuda
PROGRAMMING
Takaya Nakamura
Tomohiro Obayashi
Yuya Yamate
Etsuma Oda
Hirokazu Kobayashi
Kouji Kikkawa
Satoshi Ohtake
DESIGN DIRECTOR
Riki Fuhrmann
LEAD DESIGN
Natsuki Tsuji
MOTIF DESIGN
Kouichi Noda
MOTIF MODELING
Sachie Mikuni
Tomomi Ishii
Katsu Midorikawa
CHARACTER/ITEM DESIGN
Shingo Kabaya
Yusuke Ishikawa
CHARACTER MODELING
Yousuke Uchino
ITEM MODELING
Haruka Hirota
EFFECT DESIGN
Muneyuki Tejima
ANIMATION
Yuusuke Morino
UI DESIGN DIRECTOR
Yukari Kemmochi
YU DESIGN
Ikumi Maruyama
Yoshiki amada
Yuji Oshimoto
Yuri Kobayahsi
SOUND
Kiyoshi Hazemoto
Hirokazu Ando
Yuki Shimooka
Jun Ishikawa
VOICE
Makiko Ohmoto
Ryoka Yuzuki
Rie Takahashi
Reina Ueda
TEAM SUPPORT
Yoshimi Takahashi
Katsuhiro Sadoka
Shigeru Hashiguchi
Shigeru Hirayama
TECHNICAL SUPPORT
Tetsuya Noge
Shun Yasaka
Koichiro Hirano
Mitsuo Iwamoto
ARTWORK
Yuto Ibaraki
Tomomi Ozaki
Emi Imamura
TESTING
Yuta Wada
Masaru Kobayashi
Daisuke Fujita
Daiki Moriyama
Maki Yoshitake
Aiho Kubo
Yuichi Shimoda
Keisuke Kaneko
HAL Debug Team
DIGITAL HEARTS Co., Ltd.
Mario Club Co., Ltd.
LOCALIZATION MANAGEMENT
Seiji Otoguro
Tetsuya Abe
SPECIAL THANLS
Hiroki Azumada
Yasuo Takagi
Yoshihiro Nagata
Ayaka Seno
Hiroaki Nakano
Takashi Nozue
Yuki Endo
Tatsuya Kamiyama
Kenichiro Kita
Mitsuya Naito
Akimitsu Ushikoshi
Megumi Miyazawa
Akira Ozawa
Toshiki Ozawa
Youko Kosuki
Mako Asakawa
Tomohiro Minemura
Akira Eguchi
Yumi Osada
Rieko Kawahara
Masayo Nakagami
Yuki Yada
Yurina Inoue
Sumiko Bessho
Chieko Obikane
Satoshi Ishida
Haruka Abe
Hiroaki Ikarashi
Jeff Miller
Good-Feel Co., Ltd.
COORDINATORS
Kenta Nakanishi
Kei Ninomiya
PROJECT MANAGEMENT
Yoshiki Suzuki
Isao Takahashi
Tatsuya Kikuchi
PRODUCERS
Tadashi Kamitake
Jun Tsuda
Toyokazu Nonaka
Akira Kinashi
GENERAL PRODUCERS
Shigefumi Kawase
Shinya Takahashi
Katsuya Eguchi
EXECUTIVE PRODUCER
Shuntaro Furukawa
Yamagami is still absent as a producer in the Kirby series…
This almost certainly means that he gave up the position of producer to Kinashi.
Maybe moved onto another mobile group or division? Health concern? Left for another company?
Very odd. Yamagami was pound for pound, responsible for producing the most games for Nintendo.