Games like Nyaruru Fishy Fight
Games like Nyaruru Fishy Fight include Rabi-Ribi, Afterimage, Momodora: Reverie Under The Moonlight, Ori and the Will of the Wisps, and Bloodstained: Ritual of the Night. We matched them by the tags players give Nyaruru Fishy Fight on Steam (Metroidvania, Cute, Anime, 2D Platformer, and Exploration): closest matches first, and among equally close ones the better-known games.

Rabi-Ribi
Shared: Metroidvania · Anime · Cute

Afterimage
Shared: Metroidvania · Anime · 2D Platformer

Momodora: Reverie Under The Moonlight
Shared: Metroidvania · 2D Platformer · Exploration

Ori and the Will of the Wisps
Shared: Metroidvania · Platformer · Cute

Bloodstained: Ritual of the Night
Shared: Metroidvania · Female Protagonist · Anime

Hollow Knight: Silksong
Shared: Metroidvania · Exploration · Platformer

Hollow Knight
Shared: Metroidvania · Platformer · Exploration

Record of Lodoss War-Deedlit in Wonder Labyrinth-
Shared: Metroidvania · Female Protagonist · Exploration

Touhou Luna Nights
Shared: Metroidvania · Exploration · Female Protagonist

Celeste
Shared: 2D Platformer · Pixel Graphics · Female Protagonist

Lost Ruins
Shared: Metroidvania · Anime · Cute

Shantae and the Seven Sirens
Shared: Metroidvania · Cute · Female Protagonist

Castlevania: Belmont's Curse
Shared: Metroidvania · 2D Platformer · Female Protagonist

F.I.S.T.: Forged In Shadow Torch
Shared: Metroidvania · 2D Platformer · Platformer

Frontier Hunter: Erza’s Wheel of Fortune
Shared: Metroidvania · Anime · Female Protagonist

Cave Story+
Shared: Metroidvania · Exploration · Cute

Momodora: Moonlit Farewell
Shared: Metroidvania · Anime · Action-Adventure

Gensokyo Night Festival
Shared: Metroidvania · Cute · Pixel Graphics

9 Years of Shadows
Shared: Metroidvania · Anime · Platformer

Well Dweller
Shared: Metroidvania · Cute · Action-Adventure

Rain World
Shared: Exploration · Platformer · Pixel Graphics

Webbed
Shared: Cute · 2D Platformer · Exploration

Shantae: Half-Genie Hero
Shared: Metroidvania · Cute · Female Protagonist

Dust: An Elysian Tail
Shared: Metroidvania · Platformer · Adventure