Free games like Sentinel 4: Dark Star
Below are 8 free-to-play Steam games similar to Sentinel 4: Dark Star, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Sentinel 4: Dark Star page.
Ranked picks
- 1
The Riftbreaker: Prologue
Free-to-play alternative to Sentinel 4: Dark Star — no purchase or trial window. Shares Strategy and Indie with Sentinel 4: Dark Star.
The Riftbreaker: Prologue allows you to experience the events taking place before the story campaign of the main game. Explore an entirely new world. Gather resources. Build up a base. Defend yourself from thousands of alien creatures.
- 2
Sporadic Spire
Free-to-play alternative to Sentinel 4: Dark Star — no purchase or trial window. Shares Strategy and Indie with Sentinel 4: Dark Star.
Defeat hordes of enemies in this aesthetic tower defense game. The random terrain generation provides a beautiful environment and a unique experience every time you play.
- 3
Dropzone
Free-to-play alternative to Sentinel 4: Dark Star — no purchase or trial window. Shares Strategy with Sentinel 4: Dark Star.
Dropzone is a game of action, strategy and skill. Win 15 minute battles by scoring points. Unlock gear, customize your squad of up to 3 Units and compete in Team 3v3, 2v2 or 1v1 matches. Lay claim to the riches of Europa!
- 4
Tep The Destroyer TD
Free-to-play alternative to Sentinel 4: Dark Star — no purchase or trial window. Shares Strategy and Indie with Sentinel 4: Dark Star.
TEP the destroyer is a single player tower defense game where you will face alien monsters and ships in ground and space battles! Your strategy will decide the fate of your people in a sci-fi environment of varying difficulties!
- 5
Throbax TD
Free-to-play alternative to Sentinel 4: Dark Star — no purchase or trial window. Shares Strategy and Indie with Sentinel 4: Dark Star.
Throbax TD is the "Tower Defense" game you are looking for: Help Ughlar fight his way through 50 levels, buy over 100 upgrades and get all of the 50+ achievements.
- 6
Eden Rising
Free-to-play alternative to Sentinel 4: Dark Star — no purchase or trial window. Shares Strategy and Indie with Sentinel 4: Dark Star.
Brace yourself for a brand new action-packed Open World. Explore a huge world to gather materials for gear and defenses. Use everything at your disposal to defend your bases and defeat hordes of hostile monsters. Play solo or up to 8-player online!
- 7
Space Cheese Defenders
Free-to-play alternative to Sentinel 4: Dark Star — no purchase or trial window. Shares Strategy and Indie with Sentinel 4: Dark Star.
A tower defense game with RTS elements about gathering cheese in space, where mobile carriers are able to deploy smaller spacecraft. Collect cheese to buy and upgrade spaceships and use each type to customize your playstyle and defend your base!
- 8
Wander Vyrosa
Free-to-play alternative to Sentinel 4: Dark Star — no purchase or trial window. Shares Strategy and Indie with Sentinel 4: Dark Star.
A tower-defense game with roguelite elements on fully explorable mini planets! Travel the galaxy of Vyrosa, land on planets, and defend your drilling equipment while mining fuel to continue your journey throughout the galaxy!