Games like 28天半衰期
Games like 28天半衰期 include DELTARUNE, Undertale, South Park™: The Stick of Truth™, Billionaire Lovers, and South Park™: The Fractured But Whole™. We matched them by the tags players give 28天半衰期 on Steam (RPG, Visual Novel, 2D Platformer, 2D, and Anime): closest matches first, and among equally close ones the better-known games.

DELTARUNE
Shared: RPG · 2D · Funny

Undertale
Shared: RPG · Story Rich · 2D

South Park™: The Stick of Truth™
Shared: RPG · Comedy · 2D

Billionaire Lovers
Shared: RPG · Visual Novel · Anime

South Park™: The Fractured But Whole™
Shared: RPG · Comedy · Funny

Finding Paradise
Shared: RPG · 2D · Emotional

Persona 5 Royal
Shared: RPG · Anime · Story Rich

Mirror 2: Project X
Shared: Visual Novel · Anime · RPG

Otaku's Adventure
Shared: Visual Novel · RPG · Funny

Persona 4 Golden
Shared: RPG · Anime · Story Rich

CLANNAD
Shared: Visual Novel · Anime · Story Rich

Phoenix Wright: Ace Attorney Trilogy
Shared: Visual Novel · Anime · Story Rich

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

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Visual Novel · Anime · Emotional

The NOexistenceN of you AND me
Shared: Visual Novel · Anime · Multiple Endings

Aliya: Timelink
Shared: RPG · Visual Novel · 2D

Marco & The Galaxy Dragon
Shared: Visual Novel · Anime · Story Rich

WITCH ON THE HOLY NIGHT
Shared: Visual Novel · Anime · 2D

Impostor Factory
Shared: RPG · 2D · Emotional

Volcano Princess
Shared: RPG · Visual Novel · Anime

ATRI -My Dear Moments-
Shared: Visual Novel · Anime · Story Rich

Hyperdimension Neptunia Re;Birth1
Shared: RPG · Anime · Comedy

Fate/stay night REMASTERED
Shared: Visual Novel · Anime · 2D

DATE A LIVE: Rio Reincarnation
Shared: Visual Novel · Anime · RPG