Games like Phantast
Games like Phantast include Chippy, 12 is Better Than 6, Cuphead, Voidigo, and SYNTHETIK: Legion Rising. We matched them by the tags players give Phantast on Steam (Shoot 'Em Up, Top-Down Shooter, Twin Stick Shooter, Colorful, and Stylized): closest matches first, and among equally close ones the better-known games.
Chippy
Shared: Twin Stick Shooter · Shoot 'Em Up · Top-Down Shooter
12 is Better Than 6
Shared: Top-Down Shooter · Shooter · Hand-drawn
Cuphead
Shared: Difficult · Hand-drawn · 2D
Voidigo
Shared: Twin Stick Shooter · Shoot 'Em Up · Top-Down Shooter
SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Twin Stick Shooter · Difficult
Insect Swarm
Shared: Shoot 'Em Up · Top-Down Shooter · Twin Stick Shooter
The Hong Kong Massacre
Shared: Top-Down Shooter · Twin Stick Shooter · Shoot 'Em Up
RUINER
Shared: Top-Down Shooter · Twin Stick Shooter · Action
HELLDIVERS™ Dive Harder Edition
Shared: Top-Down Shooter · Twin Stick Shooter · Shooter
Sektori
Shared: Shoot 'Em Up · Twin Stick Shooter · Colorful
A Dance of Fire and Ice
Shared: Difficult · Colorful · 2D
Brigador: Up-Armored Edition
Shared: Twin Stick Shooter · Top-Down Shooter · Difficult
Geometry Dash
Shared: Difficult · Colorful · 2D
Beat Hazard
Shared: Twin Stick Shooter · Shoot 'Em Up · 2D
Bit Blaster XL
Shared: Shoot 'Em Up · Difficult · Shooter
Waves
Shared: Shoot 'Em Up · Twin Stick Shooter · Shooter
POSTAL
Shared: Top-Down Shooter · Twin Stick Shooter · Shooter
Cyberhunt
Shared: Shoot 'Em Up · Twin Stick Shooter · Indie
Minishoot' Adventures
Shared: Twin Stick Shooter · Top-Down Shooter · Top-Down
Nex Machina
Shared: Twin Stick Shooter · Shoot 'Em Up · Difficult
Sky Force Reloaded
Shared: Shoot 'Em Up · Top-Down Shooter · Top-Down
God's Trigger
Shared: Top-Down Shooter · Shoot 'Em Up · Twin Stick Shooter
KILL KNIGHT
Shared: Top-Down Shooter · Stylized · Twin Stick Shooter
Hotline Miami
Shared: Top-Down · Action · Indie