Games like SlimeIsland
Games like SlimeIsland include Vampire Survivors, ELDEN RING NIGHTREIGN, Hades, Megabonk, and Haste. We matched them by the tags players give SlimeIsland on Steam (Battle Royale, Third Person, Roguelite, Sports, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Roguelite · Singleplayer · Roguelike

ELDEN RING NIGHTREIGN
Shared: Third Person · Singleplayer · Roguelike

Hades
Shared: Roguelite · Singleplayer · Roguelike

Megabonk
Shared: Roguelite · Roguelike · Singleplayer

Haste
Shared: Roguelite · 3D Platformer · Singleplayer

FINAL FANTASY VII REMAKE INTERGRADE
Shared: RPG · Singleplayer · Third Person

Ratchet & Clank: Rift Apart
Shared: Third Person · 3D Platformer · Singleplayer

Brotato
Shared: Singleplayer · Roguelike · Roguelite

Garfield Kart - Furious Racing
Shared: Sports · Third Person · Cute

Hades II
Shared: Roguelite · Roguelike · RPG

Chinese Online Game
Shared: Roguelite · 3D Platformer · RPG

A Hat in Time
Shared: 3D Platformer · Cute · Third Person

Balatro
Shared: Singleplayer · Roguelike · Roguelite

CloverPit
Shared: Roguelite · Roguelike · Singleplayer

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: 3D Platformer · Singleplayer · Casual

Sephiria
Shared: Roguelite · Roguelike · RPG

Another Crab's Treasure
Shared: 3D Platformer · Third Person · Action-Adventure

Tinykin
Shared: 3D Platformer · Third Person · Cute

Gunfire Reborn
Shared: Roguelite · Roguelike · RPG

Assassin's Creed® Odyssey
Shared: RPG · Singleplayer · Third Person

FANTASY LIFE i: The Girl Who Steals Time
Shared: RPG · Casual · Cute

暖雪 Warm Snow
Shared: Roguelite · Roguelike · RPG

ATLYSS
Shared: RPG · 3D Platformer · Cute

Touhou Dystopian
Shared: Roguelite · Third Person · Cute