Games like Small Hero
Games like Small Hero include Vampire Survivors, Brotato, Melvor Idle, Undertale, and Megabonk. We matched them by the tags players give Small Hero on Steam (Casual, Bullet Hell, Roguelike, RPG, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Casual · Roguelike

Brotato
Shared: Roguelike · Bullet Hell · Singleplayer

Melvor Idle
Shared: Casual · RPG · Singleplayer

Undertale
Shared: RPG · Singleplayer · Indie

Megabonk
Shared: Roguelike · Bullet Hell · Indie

Death Must Die
Shared: Bullet Hell · RPG · Roguelike

DELTARUNE
Shared: RPG · Bullet Hell · Singleplayer

Enter the Gungeon
Shared: Bullet Hell · Roguelike · Indie

Balatro
Shared: Roguelike · Singleplayer · Casual

Zup! S
Shared: Casual · Indie · Singleplayer

How Many Dudes? The Roguelike Autobattler
Shared: Casual · Roguelike · Singleplayer

Chinese Parents
Shared: Casual · RPG · Indie

Boneraiser Minions
Shared: Bullet Hell · Casual · Indie

Noobs Want to Live
Shared: Bullet Hell · Roguelike · Casual

Magicraft
Shared: Bullet Hell · Roguelike · RPG

Touhou Endless Dream
Shared: Casual · Roguelike · Cartoon

The Binding of Isaac: Rebirth
Shared: Roguelike · Indie · Singleplayer

Home Behind
Shared: RPG · Casual · Indie

Cat Quest
Shared: RPG · Cute · Casual

Rogue Legacy
Shared: Roguelike · Indie · Singleplayer

Halls of Torment
Shared: Bullet Hell · Roguelike · RPG

Stoneshard
Shared: Roguelike · RPG · Singleplayer

Ballionaire
Shared: Casual · Singleplayer · Roguelike

Plants vs. Zombies GOTY Edition
Shared: Casual · Singleplayer · 2D