Games like Phantasmata
Games like Phantasmata include Bomb Rush Cyberfunk, Touhou Endless Dream, Hylics, Mysteria ~Occult Shadows~, and Dungeon Munchies. We matched them by the tags players give Phantasmata on Steam (Early Access, Indie, Anime, Cartoon, and Stylized): closest matches first, and among equally close ones the better-known games.

Bomb Rush Cyberfunk
Shared: Stylized · Colorful · Adventure

Touhou Endless Dream
Shared: Anime · Cartoon · Indie

Hylics
Shared: Indie · Psychedelic · RPG

Mysteria ~Occult Shadows~
Shared: Anime · Indie · Adventure

Dungeon Munchies
Shared: Indie · Anime · Adventure

Dodgeball Academia
Shared: Anime · Cartoon · Adventure

Slime Rancher
Shared: Cute · Colorful · Adventure

Persona 5 Royal
Shared: Anime · JRPG · Colorful

Carto
Shared: Indie · Cute · Adventure

ICEY
Shared: Anime · Indie · Adventure

OMORI
Shared: Indie · Colorful · RPG

Demon Slayer -Kimetsu no Yaiba- The Hinokami Chronicles
Shared: Anime · Cartoon · Adventure

Metaphor: ReFantazio
Shared: Anime · RPG · Adventure

Muse Dash
Shared: Anime · Cute · Indie

Recettear: An Item Shop's Tale
Shared: Anime · Indie · RPG

Chants of Sennaar
Shared: Indie · Colorful · Adventure

Snufkin: Melody of Moominvalley
Shared: Colorful · Stylized · Indie

Ni no Kuni™ II: Revenant Kingdom
Shared: Anime · RPG · Adventure

Monster Boy and the Cursed Kingdom
Shared: Indie · Adventure · Anime

永远消失的幻想乡 ~ The Disappearing of Gensokyo
Shared: Anime · Indie · Cute

Touhou Blooming Chaos 2
Shared: Indie · Anime · Adventure

ATLYSS
Shared: Cute · RPG · Stylized

Chrono Ark
Shared: Anime · Indie · RPG

Little Witch Nobeta
Shared: Anime · Cute · Adventure