Games like Memoir
Games like Memoir include Zup! S, Firework, Some Some Convenience Store, Gorogoa, and Zup!. We matched them by the tags players give Memoir on Steam (Casual, Visual Novel, 2D, Singleplayer, and Puzzle): closest matches first, and among equally close ones the better-known games.

Zup! S
Shared: Casual · Puzzle · 2D

Firework
Shared: 2D · Puzzle · Indie

Some Some Convenience Store
Shared: Visual Novel · Casual · Dating Sim

Gorogoa
Shared: Puzzle · Casual · Singleplayer

Zup!
Shared: Casual · Puzzle · 2D

Flowers Blooming at the End of Summer
Shared: Visual Novel · Casual · Indie

Zup! 2
Shared: Casual · Puzzle · 2D

Zup! F
Shared: Casual · Puzzle · 2D

Baba Is You
Shared: Puzzle · Singleplayer · Indie

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

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

Zup! X
Shared: Casual · Puzzle · 2D

Tricolour Lovestory
Shared: Visual Novel · Casual · Dating Sim

Hexcells
Shared: Casual · Puzzle · Singleplayer

World of Goo
Shared: Puzzle · Casual · Singleplayer

Assemble with Care
Shared: Casual · Puzzle · Indie

Fox Hime Zero
Shared: Visual Novel · Casual · Indie

Zup! 3
Shared: Casual · Puzzle · 2D

Little Inferno
Shared: Casual · Singleplayer · Puzzle

Peggle Deluxe
Shared: Casual · Puzzle · Singleplayer

NEKOPARA Vol. 0
Shared: Visual Novel · Singleplayer · Casual

Miracle Snack Shop
Shared: Visual Novel · Casual · Dating Sim

Glass Masquerade
Shared: Casual · Puzzle · Indie