Games like Millie and Molly
Games like Millie and Molly include Plants vs. Zombies GOTY Edition, FEZ, There Is No Game: Wrong Dimension, LIMBO, and Scribblenauts Unlimited. We matched them by the tags players give Millie and Molly on Steam (Strategy, Puzzle, Casual, Puzzle Platformer, and Old School): closest matches first, and among equally close ones the better-known games.

Plants vs. Zombies GOTY Edition
Shared: Strategy · Casual · 2D

FEZ
Shared: Puzzle · Pixel Graphics · Casual

There Is No Game: Wrong Dimension
Shared: Puzzle · Adventure · Casual

LIMBO
Shared: Puzzle · Puzzle Platformer · 2D

Scribblenauts Unlimited
Shared: Puzzle · Casual · Adventure

Braid
Shared: Puzzle · Puzzle Platformer · 2D

Monument Valley
Shared: Puzzle · Casual · Adventure

Peggle Deluxe
Shared: Puzzle · Casual · 2D

UFO 50
Shared: Strategy · Pixel Graphics · 2D

Death Coming/死神来了
Shared: Strategy · Casual · Puzzle

Zuma Deluxe
Shared: Puzzle · Strategy · Casual

Zup!
Shared: Puzzle · Casual · 2D

Kingdom Rush - Tower Defense
Shared: Strategy · 2D · Casual

The Escapists
Shared: Strategy · Pixel Graphics · 2D

Planet of Lana
Shared: Puzzle Platformer · Puzzle · 2D Platformer

Moonleap
Shared: Puzzle · Puzzle Platformer · Strategy

Zup! S
Shared: Puzzle · Casual · 2D

Laughing to Die
Shared: Puzzle · Casual · Adventure

Webbed
Shared: Puzzle Platformer · Pixel Graphics · 2D Platformer

Waveform
Shared: Puzzle · Casual · Strategy

Moncage
Shared: Puzzle · Casual · Adventure

Mini Metro
Shared: Strategy · Puzzle · Casual

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · 2D · Casual

Celeste
Shared: Pixel Graphics · 2D · 2D Platformer