Games like Help! I'm Turning Into A Mermaid!
Games like Help! I'm Turning Into A Mermaid! include Volcano Princess, 鬼谷八荒 Tale of Immortal, Magical Princess, School Days, and 小白兔电商~Bunny e-Shop. We matched them by the tags players give Help! I'm Turning Into A Mermaid! on Steam (Adventure, Dating Sim, Simulation, Life Sim, and Time Management): closest matches first, and among equally close ones the better-known games.

Volcano Princess
Shared: Life Sim · Dating Sim · Simulation

鬼谷八荒 Tale of Immortal
Shared: Simulation · Dating Sim · Adventure

Magical Princess
Shared: Life Sim · Simulation · Dating Sim

School Days
Shared: Dating Sim · Life Sim · Time Management

小白兔电商~Bunny e-Shop
Shared: Dating Sim · Simulation · Life Sim

Sultan's Game
Shared: Adventure · Simulation · Singleplayer

The Sims™ 4
Shared: Life Sim · Simulation · Dating Sim

Growing Up
Shared: Life Sim · Simulation · Adventure

Fields of Mistria
Shared: Dating Sim · Life Sim · Simulation

Letters From a Rainy Day -Oceans and Lace-
Shared: Adventure · Dating Sim · LGBTQ+

inZOI
Shared: Life Sim · Simulation · Dating Sim

Coral Island
Shared: Dating Sim · Life Sim · Simulation

Little Goody Two Shoes
Shared: Adventure · Dating Sim · LGBTQ+

Chinese Parents
Shared: Life Sim · Simulation · Dating Sim

Lucy -The Eternity She Wished For-
Shared: Dating Sim · Anime · Simulation

Date Everything!
Shared: Dating Sim · Simulation · LGBTQ+

Hookah Haze
Shared: Adventure · Dating Sim · Life Sim

1 to 1 humanoid edible toys
Shared: Dating Sim · Adventure · LGBTQ+

Youtubers Life
Shared: Life Sim · Adventure · Simulation

Marco & The Galaxy Dragon
Shared: Adventure · Anime · Simulation

STORY OF SEASONS: Friends of Mineral Town
Shared: Simulation · Dating Sim · Life Sim

TOGETHER BnB
Shared: Dating Sim · Simulation · Adventure

Tricolour Lovestory
Shared: Dating Sim · Simulation · Anime

Potion Permit
Shared: Life Sim · Dating Sim · Adventure