Games like Water Festa
Games like Water Festa include Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil, ICEY, Mirage Feathers, 永远消失的幻想乡 ~ The Disappearing of Gensokyo, and Rabi-Ribi. We matched them by the tags players give Water Festa on Steam (Anime, Shooter, Action, Bullet Hell, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Shoot 'Em Up · Action

ICEY
Shared: Anime · Action · Female Protagonist

Mirage Feathers
Shared: Anime · Bullet Hell · Shooter

永远消失的幻想乡 ~ The Disappearing of Gensokyo
Shared: Anime · Bullet Hell · Action

Rabi-Ribi
Shared: Anime · Bullet Hell · Female Protagonist

Muse Dash
Shared: Anime · Female Protagonist · Cute

Tomb Raider Game of the Year
Shared: Action · Female Protagonist · Adventure

Touhou Hero of Ice Fairy
Shared: Anime · Bullet Hell · Female Protagonist

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Action · Shoot 'Em Up

Rise of the Tomb Raider™
Shared: Action · Female Protagonist · Adventure

Azur Lane Crosswave
Shared: Anime · Action · Female Protagonist

Bright Memory
Shared: Shooter · Female Protagonist · Action

TouHou Makuka Sai ~ Fantastic Danmaku Festival Part III
Shared: Bullet Hell · Anime · Shoot 'Em Up

Neptunia Shooter
Shared: Action · Anime · Bullet Hell

Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Shooter · Bullet Hell

Mushihimesama
Shared: Bullet Hell · Action · Shoot 'Em Up

DRAINUS
Shared: Action · Shooter · Shoot 'Em Up

Little Witch Nobeta
Shared: Anime · Action · Female Protagonist

Escape From Duckov
Shared: Action · Shooter · Adventure

TouHou Makuka Sai ~ Fantastic Danmaku Festival
Shared: Bullet Hell · Action · Anime

The Vagrant
Shared: Action · Female Protagonist · 2D

Black Market of Bulletphilia ~ 100th Black Market.
Shared: Shooter · Shoot 'Em Up · Female Protagonist

TouHou Makuka Sai ~ Fantastic Danmaku Festival Part II
Shared: Bullet Hell · Shoot 'Em Up · Anime

Last Command
Shared: Anime · Bullet Hell · Action