Games like Save the Planet
Games like Save the Planet include Zuma Deluxe, Peggle Deluxe, Bejeweled® 3, Zuma's Revenge!, and Progressbar95. We matched them by the tags players give Save the Planet on Steam (Casual, Match 3, Puzzle, Arcade, and 2D): closest matches first, and among equally close ones the better-known games.

Zuma Deluxe
Shared: Match 3 · Puzzle · Arcade

Peggle Deluxe
Shared: Casual · Puzzle · Arcade

Bejeweled® 3
Shared: Casual · Puzzle · Match 3

Zuma's Revenge!
Shared: Casual · Puzzle · Match 3

Progressbar95
Shared: Casual · Arcade · Puzzle

Peggle™ Nights
Shared: Casual · Puzzle · 2D

Zup! S
Shared: Casual · Puzzle · 2D

Zup!
Shared: Casual · Puzzle · 2D

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

Waveform
Shared: Puzzle · Casual · Arcade

Scribblenauts Unlimited
Shared: Casual · Puzzle · 2D

Defy Gravity Extended
Shared: Puzzle · 2D · Casual

PuzzleQuest: Challenge of the Warlords
Shared: Match 3 · Casual · Puzzle

10,000,000
Shared: Match 3 · Casual · Puzzle

RetroMaze
Shared: Casual · Puzzle · 2D

Intergalactic Bubbles
Shared: Casual · Puzzle · Arcade

Marble Mayhem: Fragile Ball
Shared: Casual · Puzzle · 2D

Vampire Survivors
Shared: 2D · Casual · Arcade

Zup! 2
Shared: Casual · Puzzle · 2D

Hook
Shared: Casual · Puzzle · Singleplayer

Zup! F
Shared: Casual · Puzzle · 2D

Gorogoa
Shared: Puzzle · Casual · Singleplayer

Zup! X
Shared: Casual · Puzzle · 2D

Is This Seat Taken?
Shared: Casual · Puzzle · 2D