Games like Hero Boy
Games like Hero Boy include Firework, KinitoPET, Poppy Playtime, Five Nights at Freddy's, and DISTRAINT: Deluxe Edition. We matched them by the tags players give Hero Boy on Steam (Indie, Horror, Beat 'em up, Zombies, and Cartoony): closest matches first, and among equally close ones the better-known games.

Firework
Shared: Indie · Horror · 2D

KinitoPET
Shared: Horror · Indie · Psychological Horror

Poppy Playtime
Shared: Horror · Singleplayer · Indie

Five Nights at Freddy's
Shared: Horror · Indie · Singleplayer

DISTRAINT: Deluxe Edition
Shared: Indie · Horror · Psychological Horror

No, I'm not a Human
Shared: Horror · Indie · Psychological Horror

Sally Face - Episode One
Shared: Indie · Horror · Psychological Horror

Bendy and the Ink Machine
Shared: Horror · Cartoony · Singleplayer

Garten of Banban
Shared: Horror · Singleplayer · Cartoony

Getting Over It with Bennett Foddy
Shared: Horror · Psychological Horror · Singleplayer

Lobotomy Corporation | Monster Management Simulation
Shared: Horror · Psychological Horror · Indie

Pony Island
Shared: Indie · Horror · Psychological Horror

OMORI
Shared: Indie · Psychological Horror · Horror

Resident Evil 7 Biohazard
Shared: Horror · Singleplayer · Zombies

Five Nights at Freddy's 2
Shared: Horror · Singleplayer · Indie

MiSide
Shared: Horror · Psychological Horror · Singleplayer

Little Misfortune
Shared: Indie · Horror · Psychological Horror

Resident Evil 2
Shared: Horror · Zombies · Singleplayer

Little Nightmares
Shared: Horror · Indie · Singleplayer

The Witch's House MV
Shared: Horror · Indie · 2D

Bendy and the Dark Revival
Shared: Horror · Indie · Singleplayer

Neverending Nightmares
Shared: Horror · Indie · Psychological Horror

Fran Bow
Shared: Horror · Indie · Psychological Horror

Mouthwashing
Shared: Horror · Indie · Psychological Horror