Games like Upward
Games like Upward include A Hat in Time, Chained Together, Donut County, Human Fall Flat, and Totally Accurate Battle Simulator. We matched them by the tags players give Upward on Steam (Third Person, Minimalist, Funny, Parkour, and Adventure): closest matches first, and among equally close ones the better-known games.

A Hat in Time
Shared: Funny · Cute · Adventure

Chained Together
Shared: Adventure · Casual · Funny

Donut County
Shared: Funny · Indie · Casual

Human Fall Flat
Shared: Funny · Adventure · Physics

Totally Accurate Battle Simulator
Shared: Funny · Strategy · Indie

Grow Home
Shared: Adventure · Parkour · Third Person

SOS OPS!
Shared: Third Person · Funny · Physics

Pikuniku
Shared: Adventure · Indie · Casual

Slime Rancher
Shared: Adventure · Cute · Funny

Goat Simulator
Shared: Funny · Casual · Indie

Gang Beasts
Shared: Funny · Casual · Physics

Zup! S
Shared: Indie · Casual · Minimalist

I Am Bread
Shared: Funny · Adventure · Physics

Clustertruck
Shared: Parkour · Indie · Funny

RV There Yet?
Shared: Funny · Adventure · Indie

Wobbly Life
Shared: Adventure · Funny · Casual

Another Crab's Treasure
Shared: Funny · Third Person · 3D Platformer

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Casual · Funny

Carry The Glass
Shared: Funny · Adventure · Casual

Little Witch Nobeta
Shared: Funny · Third Person · Cute

Crumble
Shared: Indie · Adventure · Parkour

WHAT THE GOLF?
Shared: Funny · Indie · Physics

A Story About My Uncle
Shared: Adventure · Parkour · Indie

Placid Plastic Duck Simulator
Shared: Cute · Funny · Casual