Games like Project Kouvola
Games like Project Kouvola include Milk outside a bag of milk outside a bag of milk, STEINS;GATE, OneShot, The NOexistenceN of you AND me, and Papers, Please. We matched them by the tags players give Project Kouvola on Steam (Visual Novel, Psychedelic, Surreal, Story Rich, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

Milk outside a bag of milk outside a bag of milk
Shared: Visual Novel · Psychedelic · Story Rich

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

OneShot
Shared: Story Rich · Pixel Graphics · Multiple Endings

The NOexistenceN of you AND me
Shared: Visual Novel · Multiple Endings · Story Rich

Papers, Please
Shared: Dystopian · Multiple Endings · Story Rich

NEEDY STREAMER OVERLOAD
Shared: Visual Novel · Multiple Endings · Story Rich

The Hundred Line -Last Defense Academy-
Shared: Visual Novel · Story Rich · Multiple Endings

The Wolf Among Us
Shared: Story Rich · Visual Novel · Multiple Endings

Detroit: Become Human
Shared: Story Rich · Multiple Endings · Sci-fi

Coffee Talk
Shared: Visual Novel · Story Rich · Pixel Graphics

The Test
Shared: Story Rich · Multiple Endings · Visual Novel

q.u.q.
Shared: Visual Novel · Surreal · Multiple Endings

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Multiple Endings · Story Rich

STEINS;GATE 0
Shared: Visual Novel · Story Rich · Multiple Endings

The Red Strings Club
Shared: Story Rich · Pixel Graphics · Visual Novel

ATRI -My Dear Moments-
Shared: Visual Novel · Story Rich · Multiple Endings

Hylics
Shared: Surreal · Psychedelic · Indie

OMORI
Shared: Story Rich · Multiple Endings · Pixel Graphics

Until Then
Shared: Visual Novel · Story Rich · Pixel Graphics

Everhood
Shared: Psychedelic · Story Rich · Surreal

Undertale
Shared: Story Rich · Multiple Endings · Pixel Graphics

VA-11 Hall-A: Cyberpunk Bartender Action
Shared: Visual Novel · Story Rich · Dystopian

Critters for Sale
Shared: Visual Novel · Surreal · Psychedelic

Zero Escape: The Nonary Games
Shared: Visual Novel · Story Rich · Multiple Endings