Games like Somnium Eleven
Games like Somnium Eleven include School Days, Our Life: Beginnings & Always, LoveChoice, 鬼谷八荒 Tale of Immortal, and Sweet Home. We matched them by the tags players give Somnium Eleven on Steam (Simulation, Dating Sim, Interactive Fiction, Visual Novel, and Time Management): closest matches first, and among equally close ones the better-known games.

School Days
Shared: Dating Sim · Time Management · Choose Your Own Adventure

Our Life: Beginnings & Always
Shared: Visual Novel · Dating Sim · Romance

LoveChoice
Shared: Dating Sim · Visual Novel · Romance

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

Sweet Home
Shared: Visual Novel · Interactive Fiction · Dating Sim

Love Is All Around
Shared: Dating Sim · Visual Novel · Interactive Fiction

灾厄黑龙与谎言公主
Shared: Visual Novel · Dating Sim · Interactive Fiction

Volcano Princess
Shared: Dating Sim · Simulation · Visual Novel

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Choose Your Own Adventure · Interactive Fiction

Date Everything!
Shared: Dating Sim · Simulation · Romance

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

Tricolour Lovestory
Shared: Dating Sim · Visual Novel · Simulation

Class of '09: The Re-Up
Shared: Visual Novel · Simulation · Choose Your Own Adventure

1 to 1 humanoid edible toys
Shared: Dating Sim · Visual Novel · Simulation

Love is All Around: Echoes of Yesterday
Shared: Simulation · Dating Sim · Interactive Fiction

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

The Three Kingdoms: Rebirth
Shared: Dating Sim · Visual Novel · Interactive Fiction

I Wani Hug that Gator!
Shared: Visual Novel · Dating Sim · Choose Your Own Adventure

Hooked on You: A Dead by Daylight Dating Sim™
Shared: Dating Sim · Visual Novel · Choose Your Own Adventure

Love Curse: Find Your Soulmate
Shared: Dating Sim · Visual Novel · LGBTQ+

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Interactive Fiction · Dating Sim

Dream Daddy: A Dad Dating Simulator
Shared: Dating Sim · Simulation · Visual Novel

I Was a Teenage Exocolonist
Shared: Dating Sim · Visual Novel · Interactive Fiction

Hatoful Boyfriend
Shared: Dating Sim · Visual Novel · Otome