Games like Mosaic Melt
Games like Mosaic Melt include A Little to the Left, Zuma Deluxe, Bejeweled® 3, Unpacking, and Librarian: Tidy Up the Arcane Library!. We matched them by the tags players give Mosaic Melt on Steam (Casual, Puzzle, Organizing, Score Attack, and 2D): closest matches first, and among equally close ones the better-known games.

A Little to the Left
Shared: Puzzle · Organizing · Casual

Zuma Deluxe
Shared: Puzzle · Casual · 2D

Bejeweled® 3
Shared: Casual · Puzzle · Singleplayer

Unpacking
Shared: Casual · Organizing · Puzzle

Librarian: Tidy Up the Arcane Library!
Shared: Organizing · Casual · Puzzle

Zup! S
Shared: Casual · Puzzle · 2D

Peggle Deluxe
Shared: Casual · Puzzle · Singleplayer

Zuma's Revenge!
Shared: Casual · Puzzle · Singleplayer

Strange Jigsaws
Shared: Casual · Puzzle · 2D

Is This Seat Taken?
Shared: Casual · Puzzle · Colorful

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

Scribblenauts Unlimited
Shared: Casual · Puzzle · Singleplayer

Chuzzle Deluxe
Shared: Casual · Puzzle · Singleplayer

Zup!
Shared: Casual · Puzzle · 2D

Peggle™ Nights
Shared: Casual · Puzzle · Singleplayer

Gorogoa
Shared: Puzzle · Casual · Singleplayer

Hook
Shared: Casual · Puzzle · Singleplayer

Zup! 2
Shared: Casual · Puzzle · 2D

Cat Goes Fishing
Shared: 2D · Casual · Singleplayer

Zup! F
Shared: Casual · Puzzle · 2D

Zup! X
Shared: Casual · Puzzle · 2D

Glass Masquerade 3: Honeylines
Shared: Puzzle · Casual · 2D

Hexcells
Shared: Casual · Puzzle · Singleplayer

Samorost 1
Shared: Casual · Puzzle · 2D