Games like Vaporware Odyssey
Games like Vaporware Odyssey include Megabonk, Hades, Dead Cells, Vampire Survivors, and Hades II. We matched them by the tags players give Vaporware Odyssey on Steam (Action Roguelike, Bullet Hell, Psychedelic, Hack and Slash, and Roguelike): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Roguelike · Bullet Hell

Hades
Shared: Action Roguelike · Hack and Slash · Roguelite

Dead Cells
Shared: Action Roguelike · Roguelike · Adventure

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Hades II
Shared: Roguelike · Action Roguelike · Action

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

Halls of Torment
Shared: Action Roguelike · Bullet Hell · Roguelite

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

Death Must Die
Shared: Action Roguelike · Bullet Hell · Hack and Slash

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Roguelike

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

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Bullet Hell · Roguelike

BALL x PIT
Shared: Bullet Hell · Action Roguelike · Action

Ravenswatch
Shared: Action Roguelike · Roguelike · Action

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelike

Hero Siege
Shared: Action Roguelike · Hack and Slash · Roguelike

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

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

Nuclear Throne
Shared: Action Roguelike · Roguelike · Bullet Hell

NECROPOLIS: BRUTAL EDITION
Shared: Action Roguelike · Roguelike · Adventure

Shape of Dreams
Shared: Action Roguelike · Hack and Slash · Action

Moonlighter
Shared: Hack and Slash · Action Roguelike · Roguelike

Noobs Want to Live
Shared: Bullet Hell · Roguelike · Action Roguelike

Army of Ruin
Shared: Action Roguelike · Bullet Hell · Hack and Slash