Games like Octo's Balloon Challenge
Games like Octo's Balloon Challenge include Donut County, World of Goo, Zup! S, Unpacking, and Little Inferno. We matched them by the tags players give Octo's Balloon Challenge on Steam (Casual, Puzzle, Cute, Singleplayer, and Comedy): closest matches first, and among equally close ones the better-known games.

Donut County
Shared: Casual · Cute · Puzzle

World of Goo
Shared: Puzzle · Casual · Singleplayer

Zup! S
Shared: Casual · Puzzle · Indie

Unpacking
Shared: Casual · Cute · Puzzle

Little Inferno
Shared: Casual · Puzzle · Singleplayer

Zup!
Shared: Casual · Puzzle · Indie

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

Zup! 2
Shared: Casual · Puzzle · Indie

Zup! X
Shared: Casual · Puzzle · Indie

Zup! F
Shared: Casual · Puzzle · Indie

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

Baba Is You
Shared: Puzzle · Singleplayer · Indie

Zup! 3
Shared: Casual · Puzzle · Indie

Assemble with Care
Shared: Casual · Puzzle · Indie

Garry's Mod
Shared: Casual · Physics · Singleplayer

Pikuniku
Shared: Casual · Puzzle · Cute

Portal
Shared: Puzzle · Singleplayer · Comedy

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

Zup! 8
Shared: Casual · Puzzle · Indie

LEGO® Builder's Journey
Shared: Cute · Casual · Puzzle

WHAT THE GOLF?
Shared: Comedy · Cute · Physics

Goat Simulator
Shared: Comedy · Casual · Physics

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

Scribblenauts Unlimited
Shared: Casual · Puzzle · Singleplayer