Games like Louis
Games like Louis include Pikuniku, Thank Goodness You're Here!, Florence, There Is No Game: Wrong Dimension, and Plants vs. Zombies GOTY Edition. We matched them by the tags players give Louis on Steam (Casual, Adventure, Action-Adventure, Side Scroller, and 2D): closest matches first, and among equally close ones the better-known games.

Pikuniku
Shared: Adventure · Casual · Cute

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

Florence
Shared: Casual · Adventure · Indie

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

Plants vs. Zombies GOTY Edition
Shared: Casual · 2D · Comedy

Slime Rancher
Shared: Adventure · Cute · Casual

Scribblenauts Unlimited
Shared: Casual · Adventure · 2D

SANABI
Shared: Adventure · 2D · Action-Adventure

SUPER CHICKEN JUMPER
Shared: 2D · Action-Adventure · Cute

Donut County
Shared: Casual · Cute · Adventure

Hollow Knight
Shared: 2D · Adventure · Indie

WHAT THE GOLF?
Shared: Comedy · Casual · Action-Adventure

Montaro
Shared: Casual · Cute · 2D

Secrets of Grindea
Shared: Adventure · Indie · Action-Adventure

Hollow Knight: Silksong
Shared: 2D · Indie · Adventure

Rabi-Ribi
Shared: Action-Adventure · Cute · Side Scroller

Klonoa Phantasy Reverie Series
Shared: Adventure · Side Scroller · Action-Adventure

Where Winds Meet
Shared: Action-Adventure · Adventure · Casual

Lil' Guardsman
Shared: Adventure · Casual · 2D

Slime Rancher 2
Shared: Cute · Adventure · Casual

Geometry Dash
Shared: 2D · Difficult · Side Scroller

Home Behind
Shared: Adventure · Casual · Indie

Melvor Idle
Shared: Casual · Adventure · 2D

Say No! More
Shared: Casual · Comedy · Indie