Games like Unforgettable: 4th Dimensional Bartending
Games like Unforgettable: 4th Dimensional Bartending include Volcano Princess, Coffee Talk, The NOexistenceN of you AND me, and Roger, and Coffee Talk Episode 2: Hibiscus & Butterfly. We matched them by the tags players give Unforgettable: 4th Dimensional Bartending on Steam (Interactive Fiction, Visual Novel, Science, God Game, and Life Sim): closest matches first, and among equally close ones the better-known games.

Volcano Princess
Shared: Life Sim · Visual Novel · Choices Matter

Coffee Talk
Shared: Visual Novel · Interactive Fiction · Relaxing

The NOexistenceN of you AND me
Shared: Visual Novel · Interactive Fiction · Story Rich

and Roger
Shared: Interactive Fiction · Visual Novel · Life Sim

Coffee Talk Episode 2: Hibiscus & Butterfly
Shared: Visual Novel · Interactive Fiction · Relaxing

Refind Self: The Personality Test Game
Shared: Interactive Fiction · Visual Novel · 2D

LoveChoice
Shared: Visual Novel · Choices Matter · Story Rich

I Wani Hug that Gator!
Shared: Visual Novel · Interactive Fiction · Story Rich

Until Then
Shared: Visual Novel · Interactive Fiction · 2D

Mirror 2: Project X
Shared: Visual Novel · Interactive Fiction · Anime

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

Stardew Valley
Shared: Life Sim · Relaxing · Simulation

VA-11 Hall-A: Cyberpunk Bartender Action
Shared: Visual Novel · Story Rich · Choices Matter

The Weeping Swan: Ten Days of the City's Fall
Shared: Interactive Fiction · Visual Novel · 2D

Endless Monday: Dreams and Deadlines
Shared: Visual Novel · Interactive Fiction · 2D

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Visual Novel · Interactive Fiction · 2D

STEINS;GATE
Shared: Visual Novel · Science · Story Rich

Otaku's Adventure
Shared: Visual Novel · Funny · Interactive Fiction

Suzerain
Shared: Visual Novel · Interactive Fiction · Choices Matter

Far Away
Shared: Visual Novel · Choices Matter · Interactive Fiction

The Cosmic Wheel Sisterhood
Shared: Interactive Fiction · Visual Novel · Choices Matter

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

Vampires' Melody
Shared: Visual Novel · Interactive Fiction · Casual

Milk outside a bag of milk outside a bag of milk
Shared: Visual Novel · 2D · Story Rich