Games like Project Starship X
Games like Project Starship X include Vampire Survivors, The Binding of Isaac: Rebirth, BALL x PIT, Dead Cells, and Nova Drift. We matched them by the tags players give Project Starship X on Steam (Arcade, Roguelite, Shoot 'Em Up, Shooter, and Comedy): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Roguelite · 2D · Arcade
The Binding of Isaac: Rebirth
Shared: Great Soundtrack · Roguelike · Action Roguelike
BALL x PIT
Shared: Roguelite · Arcade · Shoot 'Em Up
Dead Cells
Shared: Roguelite · 2D · Roguelike
Nova Drift
Shared: Shoot 'Em Up · Roguelite · Arcade
Hades
Shared: Roguelite · Great Soundtrack · Action Roguelike
Skul: The Hero Slayer
Shared: Roguelite · 2D · Roguelike
Megabonk
Shared: Roguelite · Roguelike · Arcade
Nuclear Throne
Shared: Roguelite · Roguelike · Great Soundtrack
Undertale
Shared: Great Soundtrack · Singleplayer · Pixel Graphics
Streets of Rogue
Shared: Roguelite · Pixel Graphics · Action Roguelike
Voidigo
Shared: Shoot 'Em Up · Roguelite · Local Co-Op
Brotato
Shared: Singleplayer · Roguelike · Roguelite
Rogue Legacy 2
Shared: Arcade · Roguelite · Singleplayer
Broforce
Shared: 2D · Shooter · Local Co-Op
LUFTRAUSERS
Shared: Arcade · Shoot 'Em Up · Great Soundtrack
Halls of Torment
Shared: Roguelite · Arcade · Action Roguelike
Dungreed
Shared: Roguelite · Roguelike · 2D
Enter the Gungeon
Shared: Roguelike · Action Roguelike · Pixel Graphics
Risk of Rain (2013)
Shared: Great Soundtrack · Roguelike · Action Roguelike
Star of Providence
Shared: Roguelite · Shoot 'Em Up · Action Roguelike
DELTARUNE
Shared: Great Soundtrack · Singleplayer · Pixel Graphics
Risk of Rain 2
Shared: Roguelite · Roguelike · Action Roguelike
The Binding of Isaac
Shared: Roguelike · Great Soundtrack · Action Roguelike