Games like Robot and Flowers
Games like Robot and Flowers include Pizza Tower, Brawlhalla, Sonic Origins, Webbed, and Celeste. We matched them by the tags players give Robot and Flowers on Steam (Casual, 2D Platformer, Platformer, Collectathon, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Pizza Tower
Shared: 2D Platformer · Platformer · Pixel Graphics

Brawlhalla
Shared: 2D Platformer · Casual · Platformer

Sonic Origins
Shared: 2D Platformer · Platformer · Casual

Webbed
Shared: 2D Platformer · Pixel Graphics · Platformer

Celeste
Shared: Pixel Graphics · Platformer · 2D Platformer

Super Meat Boy
Shared: Platformer · 2D Platformer · Pixel Graphics

Katana ZERO
Shared: Pixel Graphics · Platformer · 2D Platformer

Trine 2: Complete Story
Shared: Platformer · 2D Platformer · Family Friendly

Cookie Clicker
Shared: Casual · Pixel Graphics · Collectathon

BattleBlock Theater®
Shared: Platformer · Comedy · 2D Platformer

SANABI
Shared: Pixel Graphics · 2D Platformer · Platformer

Thank Goodness You're Here!
Shared: Casual · 2D Platformer · Comedy

Plants vs. Zombies GOTY Edition
Shared: Casual · Singleplayer · Comedy

DAVE THE DIVER
Shared: Casual · Pixel Graphics · Singleplayer

DLC Quest
Shared: Platformer · Comedy · Pixel Graphics

Gravity Circuit
Shared: Platformer · Pixel Graphics · 2D Platformer

FEZ
Shared: Platformer · Pixel Graphics · Casual

Luna's Fishing Garden
Shared: 2D Platformer · Collectathon · Casual

Downwell
Shared: Pixel Graphics · Platformer · 2D Platformer

VVVVVV
Shared: Platformer · Pixel Graphics · 2D Platformer

Super Bunny Man
Shared: Platformer · Casual · Singleplayer

Sonic Superstars
Shared: 2D Platformer · Platformer · Casual

Scribblenauts Unlimited
Shared: Casual · Family Friendly · Comedy

Tribal Hunter
Shared: 2D Platformer · Casual · Platformer