Games like Crush Penguin
Games like Crush Penguin include Undertale, The Henry Stickmin Collection, Dispatch, Detroit: Become Human, and Love Is All Around. We matched them by the tags players give Crush Penguin on Steam (Capitalism, Comedy, Choices Matter, Multiple Endings, and Story Rich): closest matches first, and among equally close ones the better-known games.

Undertale
Shared: Choices Matter · Story Rich · Multiple Endings

The Henry Stickmin Collection
Shared: Multiple Endings · Comedy · Choices Matter

Dispatch
Shared: Choices Matter · Story Rich · Comedy

Detroit: Become Human
Shared: Choices Matter · Multiple Endings · Story Rich

Love Is All Around
Shared: Singleplayer · Multiple Endings · Dating Sim

Volcano Princess
Shared: Choices Matter · Multiple Endings · Dating Sim

LoveChoice
Shared: Choices Matter · Story Rich · Multiple Endings

Emily is Away <3
Shared: Choices Matter · Multiple Endings · Indie

Emily is Away Too
Shared: Choices Matter · Indie · Story Rich

The Coffin of Andy and Leyley
Shared: Multiple Endings · Story Rich · Choices Matter

Slay the Princess — The Pristine Cut
Shared: Choices Matter · Story Rich · Visual Novel

CLANNAD
Shared: Story Rich · Visual Novel · Multiple Endings

Monster Prom 3: Monster Roadtrip
Shared: Comedy · Choices Matter · Visual Novel

The Stanley Parable
Shared: Comedy · Indie · Multiple Endings

Monster Prom
Shared: Comedy · Choices Matter · Dating Sim

STEINS;GATE
Shared: Story Rich · Visual Novel · Multiple Endings

Class of '09: The Flip Side
Shared: Comedy · Story Rich · Visual Novel

No, I'm not a Human
Shared: Choices Matter · Indie · Story Rich

Hatoful Boyfriend
Shared: Comedy · Visual Novel · Story Rich

OneShot
Shared: Story Rich · Indie · Choices Matter

Otaku's Adventure
Shared: Multiple Endings · Indie · Visual Novel

I Wani Hug that Gator!
Shared: Story Rich · Choices Matter · Visual Novel

Monster Prom 4: Monster Con
Shared: Comedy · Choices Matter · Visual Novel

Tales from the Borderlands
Shared: Comedy · Choices Matter · Story Rich