Games like Jumpilla
Games like Jumpilla include Thank Goodness You're Here!, Celeste, Slime Rancher, Montaro, and Pikuniku. We matched them by the tags players give Jumpilla on Steam (Casual, Platformer, Adventure, Runner, and Side Scroller): closest matches first, and among equally close ones the better-known games.

Thank Goodness You're Here!
Shared: Adventure · Casual · Platformer

Celeste
Shared: Platformer · Precision Platformer · Indie

Slime Rancher
Shared: Adventure · Cute · Singleplayer

Montaro
Shared: Casual · Cute · Runner

Pikuniku
Shared: Casual · Adventure · Indie

Chained Together
Shared: Platformer · Adventure · Casual

Oozi: Earth Adventure
Shared: Platformer · Casual · 2D Platformer

Pizza Tower
Shared: Platformer · 2D Platformer · Indie

Super Meat Boy
Shared: Platformer · Precision Platformer · 2D Platformer

Donut County
Shared: Casual · Adventure · Cute

Florence
Shared: Casual · Adventure · Indie

Turbo Pug
Shared: Casual · Platformer · Side Scroller

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

Tribal Hunter
Shared: Platformer · Casual · 2D Platformer

Mark of the Ninja
Shared: Platformer · Adventure · Side Scroller

Hollow Knight
Shared: Platformer · Singleplayer · Adventure

BEEP
Shared: Platformer · Adventure · Singleplayer

FEZ
Shared: Platformer · Casual · Adventure

Pinstripe
Shared: Casual · Adventure · Platformer

Thomas Was Alone
Shared: Platformer · Side Scroller · 2D Platformer

Getting Over It with Bennett Foddy
Shared: Singleplayer · Platformer · Casual

SANABI
Shared: Adventure · Singleplayer · 2D Platformer

Kingdom Rush - Tower Defense
Shared: Casual · Singleplayer · Adventure

CATO: Buttered Cat
Shared: Adventure · Platformer · Cute