Games like Unalive
Games like Unalive include Risk of Rain (2013), Hades, Skul: The Hero Slayer, Noita, and The Binding of Isaac. We matched them by the tags players give Unalive on Steam (Indie, Action, Roguelike, and Perma Death): closest matches first, and among equally close ones the better-known games.

Risk of Rain (2013)
Shared: Indie · Roguelike · Action

Hades
Shared: Indie · Action · Roguelike

Skul: The Hero Slayer
Shared: Indie · Action · Roguelike

Noita
Shared: Roguelike · Indie · Perma Death

The Binding of Isaac
Shared: Indie · Roguelike · Action

Hades II
Shared: Action · Roguelike · Indie

FTL: Faster Than Light
Shared: Roguelike · Indie · Perma Death

Megabonk
Shared: Roguelike · Indie · Action

Rogue Legacy
Shared: Indie · Roguelike · Action

Nuclear Throne
Shared: Roguelike · Indie · Action

The Binding of Isaac: Rebirth
Shared: Indie · Roguelike · Action

Spelunky
Shared: Roguelike · Indie · Action

Gunfire Reborn
Shared: Roguelike · Indie · Action

Heat Signature
Shared: Indie · Roguelike · Action

Atomicrops
Shared: Action · Roguelike · Indie

Magicite
Shared: Indie · Roguelike · Perma Death

BPM: BULLETS PER MINUTE
Shared: Roguelike · Action · Indie

Ravenswatch
Shared: Roguelike · Action · Indie

Angvik
Shared: Indie · Action · Roguelike

Risk of Rain 2
Shared: Roguelike · Action · Indie

Stick It to the Stickman
Shared: Action · Roguelike · Indie

Enter the Gungeon
Shared: Roguelike · Indie · Action

Teleglitch: Die More Edition
Shared: Indie · Roguelike · Action

Heavy Bullets
Shared: Indie · Action · Roguelike