Games like Erma: The Game
Games like Erma: The Game include CHUCHEL, There Is No Game: Wrong Dimension, Slime Rancher, Return to Monkey Island, and That's not my Neighbor. We matched them by the tags players give Erma: The Game on Steam (Point & Click, Casual, 2D, Singleplayer, and Adventure): closest matches first, and among equally close ones the better-known games.

CHUCHEL
Shared: Casual · Point & Click · Cartoon

There Is No Game: Wrong Dimension
Shared: Point & Click · Adventure · Casual

Slime Rancher
Shared: Singleplayer · Adventure · Cute

Return to Monkey Island
Shared: Point & Click · Adventure · Singleplayer

That's not my Neighbor
Shared: Casual · Point & Click · Adventure

Later Alligator
Shared: Point & Click · Cute · Cartoony

Broken Age
Shared: Point & Click · Adventure · Singleplayer

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

Florence
Shared: Casual · Adventure · Singleplayer

Little Misfortune
Shared: Point & Click · Adventure · Singleplayer

Deponia
Shared: Point & Click · Adventure · Singleplayer

Lil' Guardsman
Shared: Point & Click · Casual · Adventure

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

Gorogoa
Shared: Singleplayer · Casual · Point & Click

Kingdom Rush - Tower Defense
Shared: 2D · Singleplayer · Casual

Melvor Idle
Shared: Casual · Singleplayer · 2D

McPixel 3
Shared: Point & Click · Adventure · 2D

Five Nights at Freddy's: Into the Pit
Shared: 2D · Adventure · Singleplayer

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

Happy Game
Shared: Casual · Cute · Singleplayer

Deponia: The Complete Journey
Shared: Point & Click · Adventure · Singleplayer

Neighbours back From Hell
Shared: Point & Click · Singleplayer · Casual

Scribblenauts Unlimited
Shared: Casual · Adventure · Singleplayer

Castle Crashers®
Shared: 2D · Adventure · Casual