Games like Illusion Carnival
Games like Illusion Carnival include Outcore: Desktop Adventure, OMORI, Turnip Boy Commits Tax Evasion, Carto, and MiSide. We matched them by the tags players give Illusion Carnival on Steam (Psychological Horror, 2.5D, Cute, Stylized, and Puzzle): closest matches first, and among equally close ones the better-known games.

Outcore: Desktop Adventure
Shared: Psychological Horror · Cute · Story Rich

OMORI
Shared: Psychological Horror · Story Rich · RPG

Turnip Boy Commits Tax Evasion
Shared: Puzzle · Psychological Horror · Exploration

Carto
Shared: Cute · Puzzle · Exploration

MiSide
Shared: Psychological Horror · Cute · Story Rich

OneShot
Shared: Cute · Story Rich · Puzzle

NEEDY STREAMER OVERLOAD
Shared: Psychological Horror · Cute · Visual Novel

The NOexistenceN of you AND me
Shared: Psychological Horror · Cute · Visual Novel

Rakuen
Shared: Cute · Puzzle · Story Rich

Sanfu
Shared: Puzzle · RPG · Hand-drawn

Changed
Shared: Cute · Psychological Horror · Puzzle

Ib
Shared: Psychological Horror · Story Rich · Exploration

NTE: Neverness to Everness
Shared: Free to Play · RPG · Exploration

Bug Fables: The Everlasting Sapling
Shared: 2.5D · Exploration · RPG

Tales of the Black Forest
Shared: RPG · Story Rich · Psychological Horror

Doki Doki Literature Club Plus!
Shared: Psychological Horror · Cute · Visual Novel

Sally Face - Episode One
Shared: Psychological Horror · Puzzle · Story Rich

Snufkin: Melody of Moominvalley
Shared: Puzzle · Stylized · RPG

Zenless Zone Zero
Shared: Cute · Free to Play · Anime

Song of Nunu: A League of Legends Story
Shared: Puzzle · Exploration · Stylized

TUNIC
Shared: Puzzle · Cute · Exploration

Samsara Room
Shared: Puzzle · Psychological Horror · Free to Play

BLACK SOULS
Shared: Cute · Psychological Horror · Story Rich

Night in the Woods
Shared: Stylized · Story Rich · Exploration