Free games like Alien Defense
Below are 9 free-to-play Steam games similar to Alien 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 Alien Defense page.
Ranked picks
- 1
Eternal Senia
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares Action and Indie with Alien Defense.
Thoughts and expectations ARPG
- 2
Tails Noir: Prologue
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares Indie and RPG with Alien Defense.
Tails Noir: Prologue is the first act of a post-noir narrative adventure. Become raccoon private eye Howard Lotor and explore dystopian Vancouver inhabited by animals as you uncover a deeply personal story of change and transformation.
- 3
Princess Remedy in a World of Hurt
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares Action and Indie with Alien Defense.
Remedy, a recent graduate from the Saturnian healing school, must descend to Hurtland and use her powers to heal everyone from stray ducks to dark lords, and finally cure the ailing Prince Hingst. It's a short, whimsical adventure with plenty of heart(s).
- 4
Epic Battle Fantasy 3
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares Indie and RPG with Alien Defense.
Epic Battle Fantasy 3 is a silly turn-based JRPG, full of useless NPCs, rabid cats, childish humor, unreasonably large weapons, anime boobs, and other nonsense. And it's totally free!
- 5
The Riftbreaker: Prologue
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares Action and Indie with Alien Defense.
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.
- 6
Trick & Treat
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares Indie with Alien Defense.
Trick or treating in a vampire's house.Trick & Treat is a light-hearted Halloween adventure. It's about exploring and solving puzzles in a spooky atmosphere. There will be some horror elements, romance, many bad ends and a happy ending of true love.
- 7
Fallout Shelter
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares RPG with Alien Defense.
Fallout Shelter puts you in control of a state-of-the-art underground Vault from Vault-Tec. Build the perfect Vault, keep your Dwellers happy, and protect them from the dangers of the Wasteland.
- 8
Clicker Heroes
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares Indie with Alien Defense.
Click your way through hordes of monsters, earn gold, and recruit quirky heroes with powerful skills. Progress even while you're idle, and watch the numbers climb into the absurd. It’s a never-ending journey of clicks, crits, and colossal damage.
- 9
Throbax TD
Free-to-play alternative to Alien Defense — no purchase or trial window. Shares Action and Indie with Alien Defense.
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.