Games like By Moonlight
Games like By Moonlight include Banana, Undertale, Volcano Princess, Emily is Away <3, and Limbus Company. We matched them by the tags players give By Moonlight on Steam (Free to Play, Casual, Indie, Visual Novel, and RPG): closest matches first, and among equally close ones the better-known games.

Banana
Shared: Free to Play · Casual · Singleplayer

Undertale
Shared: RPG · Indie · Story Rich

Volcano Princess
Shared: RPG · Visual Novel · Simulation

Emily is Away <3
Shared: Indie · Casual · Simulation

Limbus Company
Shared: Free to Play · Visual Novel · Story Rich

The Murder of Sonic the Hedgehog
Shared: Free to Play · Visual Novel · Casual

Emily is Away Too
Shared: Indie · Casual · Simulation

The Test
Shared: Simulation · Choose Your Own Adventure · Visual Novel

Where Winds Meet
Shared: Free to Play · Singleplayer · Casual

Dispatch
Shared: Story Rich · Singleplayer · Choices Matter

Chinese Parents
Shared: Casual · Simulation · Indie

Far Away
Shared: Visual Novel · Singleplayer · Indie

Game Dev Tycoon
Shared: Indie · Casual · Simulation

Growing Up
Shared: Simulation · RPG · Story Rich

LoveChoice
Shared: Visual Novel · Casual · Story Rich

Reigns
Shared: Indie · Choose Your Own Adventure · RPG

The Life and Suffering of Sir Brante
Shared: RPG · Visual Novel · Choose Your Own Adventure

Nicotine VS Fulanwang
Shared: Free to Play · RPG · Visual Novel

Sultan's Game
Shared: RPG · Singleplayer · Simulation

Monster Loves You!
Shared: Casual · Indie · Simulation

The Test: Hypothesis Rising
Shared: Simulation · Visual Novel · Choose Your Own Adventure

Plague Inc: Evolved
Shared: Indie · Simulation · Strategy

The Henry Stickmin Collection
Shared: Choose Your Own Adventure · Singleplayer · Comedy

Bongo Cat
Shared: Free to Play · Casual · Indie