Free games like Ad Astra: Sci-Fi Tower Defense
Below are 8 free-to-play Steam games similar to Ad Astra: Sci-Fi Tower Defense, 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 Ad Astra: Sci-Fi Tower Defense page.
Ranked picks
- 1
Life is Strange - Episode 1
Free-to-play alternative to Ad Astra: Sci-Fi Tower Defense — no purchase or trial window. Shares Action with Ad Astra: Sci-Fi Tower Defense.
Episode 1 now FREE! Life is Strange is an award-winning and critically acclaimed episodic adventure game that allows the player to rewind time and affect the past, present and future.
- 2
Ultimate Custom Night
Free-to-play alternative to Ad Astra: Sci-Fi Tower Defense — no purchase or trial window. Shares Action and Indie with Ad Astra: Sci-Fi Tower Defense.
Welcome to the ultimate FNAF mashup, featuring 50 selectable characters and custom difficulties!
- 3
Indigo Park: Chapter 1
Free-to-play alternative to Ad Astra: Sci-Fi Tower Defense — no purchase or trial window. Shares Action and Indie with Ad Astra: Sci-Fi Tower Defense.
Explore the abandoned childhood wonder of Indigo Park! Guided by Rambley the Raccoon, help restore power to the destroyed amusement park while you run from the reason it shut down.
- 4
STRAFTAT
Free-to-play alternative to Ad Astra: Sci-Fi Tower Defense — no purchase or trial window. Shares Action with Ad Astra: Sci-Fi Tower Defense.
STRAFTAT is a 1v1/2v2 ONLINE first person SHOOTER with quick rounds in over 350 MAPS ; Including all WEAPONS, proximity chat and 4 players FFA.
- 5
Awaria
Free-to-play alternative to Ad Astra: Sci-Fi Tower Defense — no purchase or trial window. Shares Action and Indie with Ad Astra: Sci-Fi Tower Defense.
Awaria is a short game about working in haunted maintenance tunnels.
- 6
Iron Snout
Free-to-play alternative to Ad Astra: Sci-Fi Tower Defense — no purchase or trial window. Shares Action and Indie with Ad Astra: Sci-Fi Tower Defense.
Iron Snout is a fast, colorful and brutal fighting game in which you will be helping a piglet fight for its life against hordes of wolves.
- 7
![UNBEATABLE [white label] — Steam game cover](https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1290490/header.jpg?t=1736770503)
UNBEATABLE [white label]
Free-to-play alternative to Ad Astra: Sci-Fi Tower Defense — no purchase or trial window. Shares Action and Indie with Ad Astra: Sci-Fi Tower Defense.
A young girl learns a song. An exclusive side-story set in the world of D-CELL GAMES' upcoming rhythm-adventure.
- 8
Magic Archery
Free-to-play alternative to Ad Astra: Sci-Fi Tower Defense — no purchase or trial window. Shares Indie with Ad Astra: Sci-Fi Tower Defense.
Train a commoner to become the greatest archer in this short incremental game! Increase your stats, gather wealth from quests, buy upgrades, and infuse your arrows with magic.