Games like Wispip's Siege
Games like Wispip's Siege include Terraria, SANABI, Celeste, Himno, and Webbed. We matched them by the tags players give Wispip's Siege on Steam (Adventure, Action-Adventure, Platformer, Sandbox, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Sandbox · Adventure · 2D

SANABI
Shared: Adventure · Pixel Graphics · 2D Platformer

Celeste
Shared: Platformer · Pixel Graphics · 2D Platformer

Himno
Shared: Platformer · Adventure · 2D

Webbed
Shared: 2D Platformer · Platformer · Pixel Graphics

Rain World
Shared: Exploration · Platformer · Adventure

Shovel Knight: Treasure Trove
Shared: Platformer · Adventure · Pixel Graphics

Hollow Knight
Shared: Platformer · 2D · Adventure

Owlboy
Shared: Adventure · Platformer · Pixel Graphics

VVVVVV
Shared: Platformer · Pixel Graphics · 2D Platformer

Reventure
Shared: Adventure · Platformer · Pixel Graphics

The Messenger
Shared: Platformer · Pixel Graphics · 2D

Ori and the Will of the Wisps
Shared: Platformer · Adventure · Action-Adventure

Pipistrello and the Cursed Yoyo
Shared: Action-Adventure · Exploration · Pixel Graphics

Noita
Shared: Sandbox · Pixel Graphics · 2D

Hollow Knight: Silksong
Shared: Platformer · 2D · Adventure

FEZ
Shared: Platformer · Adventure · Exploration

Super Meat Boy
Shared: Platformer · 2D Platformer · 2D

BlazBlue Entropy Effect
Shared: Action-Adventure · Platformer · 2D

Narita Boy
Shared: Adventure · Platformer · 2D

F.I.S.T.: Forged In Shadow Torch
Shared: Platformer · Adventure · 2D Platformer

Mina the Hollower
Shared: Action-Adventure · Platformer · 2D Platformer

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

Sonic Origins
Shared: Adventure · 2D Platformer · Platformer