Games like Kestrel
Games like Kestrel include Vampire Survivors, Halls of Torment, Black Myth: Wukong, Hero Siege, and BALL x PIT. We matched them by the tags players give Kestrel on Steam (Shoot 'Em Up, Action, Nature, RPG, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · Action

Halls of Torment
Shared: Bullet Hell · Action · Pixel Graphics

Black Myth: Wukong
Shared: Action · Action RPG · RPG

Hero Siege
Shared: Action RPG · RPG · Pixel Graphics

BALL x PIT
Shared: Action · Shoot 'Em Up · Bullet Hell

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Bullet Hell

Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Action RPG

LUFTRAUSERS
Shared: Action · Bullet Hell · Shoot 'Em Up

Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Action

Revolution Ace
Shared: Shoot 'Em Up · Action · Bullet Hell

Last Epoch
Shared: Action RPG · RPG · Action

Archvale
Shared: Action · Bullet Hell · Action RPG

Death Must Die
Shared: Bullet Hell · RPG · Action

ZeroRanger
Shared: Shoot 'Em Up · Action · Bullet Hell

CrossCode
Shared: RPG · Action RPG · Pixel Graphics

Wolcen: Lords of Mayhem
Shared: Action RPG · RPG · Action

Dragon's Dogma 2
Shared: RPG · Action · Action RPG

Cyberhunt
Shared: Action · Shoot 'Em Up · Pixel Graphics

Minecraft Dungeons II
Shared: Action · RPG · Action RPG

Exit the Gungeon
Shared: Action · Bullet Hell · Pixel Graphics

The Slormancer
Shared: RPG · Action RPG · Pixel Graphics

Dungeon Munchies
Shared: Action · RPG · Pixel Graphics

Eastward
Shared: Pixel Graphics · RPG · Action RPG

God of War Ragnarök
Shared: Action · RPG · Action-Adventure