Games like Solitary Sentinel
Games like Solitary Sentinel include BALL x PIT, Nuclear Throne, SNKRX, Skul: The Hero Slayer, and Vampire Survivors. We matched them by the tags players give Solitary Sentinel on Steam (Action Roguelike, Shoot 'Em Up, Top-Down Shooter, Action, and Tower Defense): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Action · Action Roguelike · Shoot 'Em Up

Nuclear Throne
Shared: Action Roguelike · Roguelike · Action

SNKRX
Shared: Action Roguelike · Top-Down Shooter · Shoot 'Em Up

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

Vampire Survivors
Shared: Action Roguelike · 2D · Roguelike

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

20 Minutes Till Dawn
Shared: Action Roguelike · Shoot 'Em Up · Top-Down Shooter

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Action Roguelike · Action

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Top-Down Shooter · PvE

Hades
Shared: Action Roguelike · Action · Roguelike

Nova Drift
Shared: Shoot 'Em Up · Action Roguelike · Shooter

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelike

Megabonk
Shared: Action Roguelike · Roguelike · Action

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

Slime 3K: Rise Against Despot
Shared: Action Roguelike · Shoot 'Em Up · Top-Down Shooter

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Indie

Star of Providence
Shared: Action Roguelike · Shoot 'Em Up · Action

SYNTHETIK 2
Shared: Action Roguelike · Top-Down Shooter · Shooter

Brotato
Shared: Action Roguelike · Roguelike · Top-Down Shooter

Risk of Rain Returns
Shared: Action Roguelike · PvE · Action

Octogeddon
Shared: Action Roguelike · Shoot 'Em Up · Action

Rogue Legacy
Shared: Action Roguelike · Action · Roguelike

Apocalypse Party
Shared: Action Roguelike · Top-Down Shooter · Shoot 'Em Up

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