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Operation Octo

Very Positive · 105 reviews · Action · 2025

Operation Octo

10 of the 12 games like Operation Octo are rated Very Positive or higher on Steam. 1 of them are free to play. Prices range from $3.99 to $19.99. Released 2021–2026. They notably share the Tower Defense, Strategy tags.

Broken Universe - Tower Defense

Very Positive · 289 reviews · Casual · 2023

Like Operation Octo: Tower Defense · Strategy · Indie

Very Positive · 289
Get ready to rethink all your defense strategies! Build barricades to stop monsters, or lure them into a maze and attack. A variety of stages that change each time depending on how you play them.
AIRethink defense strategies each time
Casual2023.02.04
$9.99

Beach Defense: Zombie Invasion

Very Positive · 171 reviews · Casual · 2026

Like Operation Octo: Casual · Tower Defense · Strategy

Very Positive · 171
Command soldiers, survive zombie waves! A light strategy game mixing turn-based & real-time strategy, bullet hell, and backpack-like mechanics. Fit troops into limited backpack slots, build max firepower, challenge difficulty levels, and defend the last beach. Perfect for tower defense & fans.
AIDefend the last beach
Casual2026.06.11
$3.99

Age of Defense: Prehistory

Very Positive · 178 reviews · Indie · 2024

Like Operation Octo: Singleplayer · Tower Defense · Strategy

Very Positive · 178
The most addicting tower defense game, packed with monsters and tough defenders, all of which fit perfectly into the cartoonish environment. Prehistory is a prologue for the main story Age of Defense.
AIDefend the prehistoric age
Indie2024.07.29
Free

Relic Guardian - Tower Defense

Very Positive · 959 reviews · Adventure · 2025

Like Operation Octo: Cartoony · Cute · 2D

Very Positive · 959
"Relic Guardian" is a fantasy style strategy tower defense game. As the builder on the battlefield, summon a variety of defense towers and spells with reliable hero companions to complete this epic and guarding adventure!
AISummon towers, command heroes wisely
Adventure2025.10.22
$19.99

The Last Friend

Very Positive · 93 reviews · Action · 2021

Like Operation Octo: Action · Indie · Singleplayer

Very Positive · 93
Doggone tired of the typical brawler or tower defense that is all bark and no bite? Then join Alpha and T. Juan on a dynamic adventure that has you battling hordes of baddies and bosses on their mission to save all the Doggos!
AILead loyal dogs to victory in hybrid combat
Action2021.09.30
$14.99

Age of Defense

Mostly Positive · 641 reviews · Indie · 2024

Like Operation Octo: Casual · Cartoon · Tower Defense

Mostly Positive · 641
Age of Defense is a tower defense game full of mind-blowing mayhem. There are tons of monsters and tough defenders in the game each of which fits perfectly into a funny cartoonish setting.
AIDefend against monster mayhem
Indie2024.07.29
$14.99

Evolit

Very Positive · 59 reviews · Casual · 2026

Like Operation Octo: Survival · Cute · Comedy

Very Positive · 59
Take charge of the galaxy's defense! With strategic moves, stop waves of cute yet dangerous enemies and prevent them from reaching the end of the road. Enhance your tactics with a variety of cards and unique towers, and stand against Evo! Strategy and infinity await here.
AIDefend the galaxy with towers
Casual2026.01.09
$8.99

Tangy TD

Very Positive · 1.5k reviews · Action · 2026

Like Operation Octo: Action · Cartoony · Tactical

Very Positive · 1.5k
Strategic tower defense where you play a witch, place class-based towers, equip them with items that grant powerful abilities, combine them, create unique builds & deal ridiculous amounts of damage! Customize your builds with a deep stat system and giant skill tree!
AIPlay a witch, build wild towers
Action2026.03.09
$9.99

Mechs V Kaijus - Tower Defense

Very Positive · 511 reviews · Action · 2022

Like Operation Octo: Bullet Hell · Indie · Base Building

Very Positive · 511
Mechs V Kaijus is an addictive hardcore tower defense gameplay. In Mechs V Kaijus you take on the role of Commander of a powerful Mechs squadron. Improve your Mech, strategically place towers and factories on the battlefield. Deploy support units on the battlefield, and save our civilization.
AICommand mechas in tower defense
Action2022.02.17
$12.99

Countless Army

Mostly Positive · 95 reviews · Indie · 2024

Like Operation Octo: Strategy · Adventure · Singleplayer

Mostly Positive · 95
Become the villain and raise an army of undead in this real-time reverse tower defense strategy game. Send waves of monsters to battle and aid them with your evil magic until they break your enemies’ defenses. It’s time for you to rule over the continent with an iron fist as its Dark Lord!
AIRule as the Dark Lord
Indie2024.07.18
$9.99

Crab God

Very Positive · 267 reviews · Adventure · 2024

Like Operation Octo: Underwater · Survival · Singleplayer

Very Positive · 267
Crab God is an atmospheric underwater strategy game. Guide your Crabling colony through wild ocean depths, and defend the egg of the next Crab God.Restore and protect diverse coral reefs, making a difference in the real world as you progress in-game. Make waves, praise the claw!
AIGuide a colony of crablings
Adventure2024.06.20
$19.99

Kingdom Rush 5: Alliance TD

Very Positive · 10.3k reviews · Indie · 2024

Like Operation Octo: Cartoon · 2D · Cartoony

Very Positive · 10.3k
While a formidable evil emerges, an unexpected alliance is taking shape! It will take the finest warriors of Linirea and the relentless Dark Army to stop it. Beware! Though they may journey side by side the ever-changing winds of fate could swiftly alter their course.
AIUnite heroes to defend
Indie2024.07.25
$19.99