Games like Frog Demon
Games like Frog Demon include Hollow Knight, Pikuniku, Rogue Legacy 2, BEEP, and Mark of the Ninja. We matched them by the tags players give Frog Demon on Steam (Indie, Casual, Action, Adventure, and Arcade): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Indie · 2D

Pikuniku
Shared: Indie · Casual · Adventure

Rogue Legacy 2
Shared: Indie · Arcade · Action

BEEP
Shared: Indie · Adventure · Platformer

Mark of the Ninja
Shared: Indie · Platformer · Action

Vampire Survivors
Shared: Indie · 2D · Casual

Dust: An Elysian Tail
Shared: Action · Indie · Platformer

Skul: The Hero Slayer
Shared: Indie · Action · 2D

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

Cyberhunt
Shared: Indie · Casual · Action

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

Rogue Legacy
Shared: Indie · Platformer · Action

Minimalism
Shared: Indie · Casual · Action

Super Fancy Pants Adventure
Shared: Indie · Action · Adventure

Timberman
Shared: Casual · Indie · Action

Spelunky
Shared: Indie · Platformer · 2D

Dead Cells
Shared: Adventure · 2D · Platformer

Shovel Knight: Treasure Trove
Shared: Indie · Platformer · Adventure

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Action · Casual

Toki Tori
Shared: Indie · Casual · Platformer

A Dance of Fire and Ice
Shared: Indie · Arcade · Singleplayer

SANABI
Shared: Action · Adventure · Indie

Florence
Shared: Indie · Casual · Adventure

Gato Roboto
Shared: Indie · Action · Adventure