Games like Vanguard Galaxy
Games like Vanguard Galaxy include Cookie Clicker, A Game About Feeding A Black Hole, Keep on Mining!, Space Rock Breaker, and Kerbal Space Program. We matched them by the tags players give Vanguard Galaxy on Steam (Idler, Space, Casual, Sandbox, and Top-Down): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Casual · Incremental

A Game About Feeding A Black Hole
Shared: Casual · Idler · Incremental

Keep on Mining!
Shared: Idler · Casual · Incremental

Space Rock Breaker
Shared: Casual · Idler · Incremental

Kerbal Space Program
Shared: Space · Sandbox · Space Sim

Shelldiver
Shared: Casual · Idler · Incremental

Spaceflight Simulator
Shared: Space · Sandbox · Space Sim

SpaceEngine
Shared: Casual · Space · Sandbox

Universe Sandbox
Shared: Space · Sandbox · Space Sim

Digseum
Shared: Idler · Casual · Incremental

X4: Foundations
Shared: Space · Sandbox · Space Sim

No Man's Sky
Shared: Space · Sandbox · Exploration

Nodebuster
Shared: Casual · Idler · Incremental

Starbound
Shared: Space · Sandbox · Crafting

SPORE™
Shared: Sandbox · Space · Casual

Stellaris
Shared: Space · Sandbox · Strategy

Fortune Mill
Shared: Idler · Incremental · Casual

Elite Dangerous
Shared: Space · Space Sim · Exploration

Dyson Sphere Program
Shared: Space · Sandbox · Resource Management

Star Valor
Shared: Space · Sandbox · Loot

Dragon Cliff
Shared: Idler · Casual · Incremental

Forage Wizard
Shared: Casual · Sandbox · Incremental

Solar 2
Shared: Space · Casual · Sandbox

Kerbal Space Program 2
Shared: Space · Sandbox · Exploration