Games like Melia Keys In... Quantum Decade
Games like Melia Keys In... Quantum Decade include Mirror 2: Project X, Undertale, Refind Self: The Personality Test Game, The NOexistenceN of you AND me, and Far Away. We matched them by the tags players give Melia Keys In... Quantum Decade on Steam (Interactive Fiction, Visual Novel, Female Protagonist, 2D, and Cute): closest matches first, and among equally close ones the better-known games.

Mirror 2: Project X
Shared: Female Protagonist · Visual Novel · Interactive Fiction

Undertale
Shared: Funny · Multiple Endings · 2D

Refind Self: The Personality Test Game
Shared: Interactive Fiction · Visual Novel · Female Protagonist

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

Far Away
Shared: Visual Novel · Female Protagonist · Cute

Marco & The Galaxy Dragon
Shared: Visual Novel · Female Protagonist · Cute

Volcano Princess
Shared: Female Protagonist · Multiple Endings · Visual Novel

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

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Visual Novel · Female Protagonist · Interactive Fiction

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

Magical Girl Witch Trials
Shared: Visual Novel · Female Protagonist · Cute

LoveChoice
Shared: Visual Novel · Cute · Multiple Endings

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

Otaku's Adventure
Shared: Visual Novel · Funny · Multiple Endings

Florence
Shared: Female Protagonist · Interactive Fiction · Cute

Class of '09: The Re-Up
Shared: Visual Novel · Female Protagonist · Comedy

NEEDY STREAMER OVERLOAD
Shared: Visual Novel · Cute · 2D

Doki Doki Literature Club Plus!
Shared: Visual Novel · Cute · 2D

The Henry Stickmin Collection
Shared: Funny · Multiple Endings · Comedy

The Cosmic Wheel Sisterhood
Shared: Female Protagonist · Interactive Fiction · Visual Novel

q.u.q.
Shared: Visual Novel · Cute · 2D

Noctuary
Shared: Interactive Fiction · Visual Novel · Cute

私のリアルは充実しすぎている フルボイス版
Shared: Visual Novel · Female Protagonist · Funny

Love, Money, Rock'n'Roll
Shared: Visual Novel · Multiple Endings · Cute