Games like DOWNFALLEN
Games like DOWNFALLEN include The Final Station, BlazBlue Entropy Effect, SANABI, Terraria, and Rain World. We matched them by the tags players give DOWNFALLEN on Steam (Action-Adventure, 2D, Top-Down, Post-apocalyptic, and Action): closest matches first, and among equally close ones the better-known games.

The Final Station
Shared: Post-apocalyptic · 2D · Pixel Graphics

BlazBlue Entropy Effect
Shared: 2D · Action-Adventure · Action

SANABI
Shared: Pixel Graphics · Action · 2D

Terraria
Shared: 2D · Pixel Graphics · Survival

Rain World
Shared: 2D · Pixel Graphics · Survival

Hyper Light Drifter
Shared: Pixel Graphics · Action · Atmospheric

ZERO Sievert
Shared: Post-apocalyptic · Top-Down · Pixel Graphics

Rise of the Tomb Raider™
Shared: Action · Action-Adventure · Adventure

The Last of Us™ Part II Remastered
Shared: Action-Adventure · Post-apocalyptic · Action

Mina the Hollower
Shared: Action-Adventure · Top-Down · Pixel Graphics

METRO Last Light Redux
Shared: Post-apocalyptic · Action · Atmospheric

Metro Exodus
Shared: Post-apocalyptic · Action · Atmospheric

Skul: The Hero Slayer
Shared: Action · 2D · Pixel Graphics

Titan Souls
Shared: Pixel Graphics · Action · 2D

METRO 2033 Redux
Shared: Post-apocalyptic · Action · Atmospheric

Scavland
Shared: Post-apocalyptic · 2D · Pixel Graphics

Eastward
Shared: Pixel Graphics · Post-apocalyptic · Action

The Escapists
Shared: 2D · Pixel Graphics · Action

METAL GEAR SOLID - Master Collection Version
Shared: Action-Adventure · Action · Stealth

Hotline Miami
Shared: Action · Top-Down · Pixel Graphics

Days Gone
Shared: Post-apocalyptic · Action-Adventure · Action

Dungeon Munchies
Shared: Action · Pixel Graphics · 2D

METAL GEAR & METAL GEAR 2: Solid Snake
Shared: Action-Adventure · Action · 2D

METAL GEAR SOLID Δ: SNAKE EATER
Shared: Action · Stealth · Action-Adventure