Games like Reek
Games like Reek include Pizza Tower, Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad, Rogue Legacy 2, Broforce, and Timberman. We matched them by the tags players give Reek on Steam (Action, Casual, Indie, 2D, and Cartoony): closest matches first, and among equally close ones the better-known games.

Pizza Tower
Shared: Indie · Cartoony · 2D Platformer

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: 2D · Casual · Arcade

Rogue Legacy 2
Shared: Action · Arcade · Indie

Broforce
Shared: Action · 2D · Indie

Timberman
Shared: Casual · Indie · Action

BattleBlock Theater®
Shared: Platformer · 2D · Comedy

Vampire Survivors
Shared: 2D · Indie · Casual

Super Meat Boy
Shared: Indie · Platformer · 2D

Oozi: Earth Adventure
Shared: Indie · Casual · Platformer

Thank Goodness You're Here!
Shared: Casual · Indie · Comedy

Move or Die
Shared: Action · 2D · Indie

Have a Nice Death
Shared: 2D · Action · Cartoony

Twin Shot Deluxe
Shared: Action · Casual · Arcade

Katana ZERO
Shared: Action · Indie · Platformer

pureya
Shared: Casual · 2D · Arcade

Rogue Legacy
Shared: Indie · Action · Platformer

Brawlhalla
Shared: Casual · 2D Platformer · Action

Pikuniku
Shared: Indie · Casual · Action

Skul: The Hero Slayer
Shared: Action · Indie · 2D

No Time To Explain Remastered
Shared: Action · Indie · Casual

SANABI
Shared: Action · 2D · Indie

Downwell
Shared: Indie · Action · Arcade

SpeedRunners
Shared: Indie · Action · 2D

Defy Gravity Extended
Shared: Indie · Platformer · Action