Games like Inevitability
Games like Inevitability include Terraria, Reassembly, Starbound, Trailmakers, and Space Engineers. We matched them by the tags players give Inevitability on Steam (Indie, Action, Adventure, Space, and Building): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Sandbox · Adventure · 2D

Reassembly
Shared: Space · Building · Action

Starbound
Shared: Space · Adventure · Sandbox

Trailmakers
Shared: Action · Space · Adventure

Space Engineers
Shared: Space · Building · Sandbox

Heat Signature
Shared: Indie · Space · Action

Kerbal Space Program
Shared: Space · Sandbox · Building

Edge of Space
Shared: Indie · Adventure · Action

Starship EVO
Shared: Indie · Action · Space

Rust
Shared: Building · Adventure · Sandbox

Deliver Us The Moon
Shared: Indie · Adventure · Action

Starcom: Nexus
Shared: Space · Action · Indie

Forager
Shared: Indie · Adventure · Sandbox

Cultivation Tales
Shared: Action · Building · Sandbox

StarMade
Shared: Space · Building · Sandbox

Cyberhunt
Shared: Indie · Action · Adventure

Kinetic Void
Shared: Indie · Space · Action

Space Pirates and Zombies
Shared: Action · Indie · Space

The Forest
Shared: Adventure · Building · Action

3030 Deathwar Redux - A Space Odyssey
Shared: Indie · Adventure · Action

Solar 2
Shared: Indie · Space · Sandbox

Space Pirates And Zombies 2
Shared: Action · Indie · Space

ARK: Survival Ascended
Shared: Adventure · Building · Action

Skul: The Hero Slayer
Shared: Indie · Action · 2D