Games like Starbucket
Games like Starbucket include Garry's Mod, Space Engineers, Starship EVO, Starbound, and Kerbal Space Program. We matched them by the tags players give Starbucket on Steam (Action, Indie, Early Access, Casual, and Space): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Casual · Building

Space Engineers
Shared: Sandbox · Space · Building

Starship EVO
Shared: Action · Indie · Space

Starbound
Shared: Sandbox · Space · Indie

Kerbal Space Program
Shared: Space · Sandbox · Indie

Reassembly
Shared: Space · Action · Building

Kinetic Void
Shared: Indie · Action · Space

Trailmakers
Shared: Action · Space · Indie

s&box
Shared: Action · Sandbox · Casual

StarMade
Shared: Space · Sandbox · Building

Tower Unite
Shared: Casual · Indie · Action

TerraTech
Shared: Sandbox · Building · Action

Wobbly Life
Shared: Sandbox · Action · Casual

Into The Flames
Shared: Action · Casual · Indie

House Flipper
Shared: Building · Casual · Sandbox

Gensokyo Night Festival
Shared: Action · Indie · Casual

Avorion
Shared: Sandbox · Space · Building

Paralives
Shared: Indie · Building · Sandbox

Solar 2
Shared: Indie · Space · Casual

Celestial Command
Shared: Indie · Action · Space

Tiny Glade
Shared: Building · Casual · Sandbox

Terraria
Shared: Sandbox · Building · Indie

Kerbal Space Program 2
Shared: Space · Sandbox · Building

Witch It
Shared: Indie · Casual · Action