Games like Monster and Snakes 1.1
Games like Monster and Snakes 1.1 include Sonic Adventure DX, SONIC X SHADOW GENERATIONS, Sonic Frontiers, Demon Slayer -Kimetsu no Yaiba- The Hinokami Chronicles, and Portal 2. We matched them by the tags players give Monster and Snakes 1.1 on Steam (Adventure, Singleplayer, 1990's, 1980s, and 3D Fighter): closest matches first, and among equally close ones the better-known games.

Sonic Adventure DX
Shared: Adventure · Platformer · Singleplayer

SONIC X SHADOW GENERATIONS
Shared: Singleplayer · 3D Platformer · Adventure

Sonic Frontiers
Shared: Adventure · Singleplayer · 3D Platformer

Demon Slayer -Kimetsu no Yaiba- The Hinokami Chronicles
Shared: Adventure · 3D Fighter · Anime

Portal 2
Shared: Singleplayer · Platformer · Adventure

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

Sonic Adventure 2
Shared: Adventure · Platformer · Singleplayer

SANABI
Shared: Adventure · Singleplayer · 2D Platformer

A Story About My Uncle
Shared: Adventure · Singleplayer · Platformer

Crash Bandicoot™ N. Sane Trilogy
Shared: Singleplayer · Adventure · Platformer

Planet of Lana
Shared: Singleplayer · Adventure · 2D Platformer

Psychonauts
Shared: Adventure · Singleplayer · Platformer

Ori and the Will of the Wisps
Shared: Singleplayer · Adventure · Platformer

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

Pumpkin Jack
Shared: Adventure · Singleplayer · 3D Platformer

Hollow Knight
Shared: Platformer · Singleplayer · Adventure

Spyro™ Reignited Trilogy
Shared: Adventure · Singleplayer · 3D Platformer

Neon White
Shared: 3D Platformer · Platformer · Singleplayer

Slime Rancher 2
Shared: Singleplayer · Adventure · Creature Collector

SpongeBob SquarePants: Battle for Bikini Bottom - Rehydrated
Shared: Adventure · 3D Platformer · Singleplayer

Pizza Tower
Shared: 2D Platformer · Singleplayer · Platformer

Celeste
Shared: Singleplayer · Platformer · 2D Platformer

Sonic Superstars
Shared: Adventure · Platformer · 2D Platformer

Crash Bandicoot™ 4: It’s About Time
Shared: Adventure · Platformer · Singleplayer