Galactic Missile Defense vs Invader Sisters
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Galactic Missile Defense
Defend Earth from alien invaders in this strategic tower defense game. Deploy advanced missile systems and upgrade your bases to counter escalating attacks. Your strategic choices are crucial to saving the planet.
- Strategic tower defense gameplay
- Variety of advanced missile weapons
- Base upgrades and boosters
- Escalating alien invasion levels
- Engaging space combat scenarios
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Arcade fun with space invaders! Use the missiles against alien invaders to win! Galactic Missile Defense is a strategy tower defence ( TD ) game set in space, where you are in charge of 3 secret anti-missile technologically-advanced bases that are the last hope to save Earth. Rush in defence action and clash with the alien invaders using strategic weapons like classic Missile, Laser, Plasma Missile, Black Hole, Nuclear Missile (Armageddon) and Heat-Seeking Missile! You can upgrade any anti-missile base with a variety of weapons and boosters but you must be careful as each choice requires strategy and skill. The Martian space invaders have their own missile weapons as well, you must be prepared for quick decisions as the action increases dramatically once you reach the higher levels and the invasion from the Martian space Kingdom reaches it's peak. Make sure to destroy their missile attacks or Earth's last line of defense will fall. So what do you say Missile Commander, are you ready to answer the call of duty and defend Earth along with the whole Galaxy, or will Earth bow down to the power of Mars? Galactic Missile Defense is the latest free arcade / strategy / Tower Defense game from the makers of Angry Chicken : Egg Madness!
Invader Sisters
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Aim the high score to defeat the enemy invaders! Anyone can play easily, it is a shooting game.
Screenshots
Verdict
The clearest difference is in-app purchases: Invader Sisters at none against Galactic Missile Defense's 4. Invader Sisters also leads on update cadence (every 2 weeks vs every 3 months). Galactic Missile Defense's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Galactic Missile Defense sells 4 one-off in-app purchases. Invader Sisters asks for nothing beyond the download.
Galactic Missile Defense ships an update every 3 months, Invader Sisters every 2 weeks. The most recent releases landed on November 9, 2026 and November 1, 2026 respectively.
| Parameter | Galactic Missile Defense | Invader Sisters |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) — better | — |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 51 MB | 19 MB |
| Age rating | 9+ | 4+ |
| Developer | Spyro Merianos | ERX |
In-app purchases
Galactic Missile Defense
- Pack of 25 Plasma$1.99
- Pack of 150 Plasma$9.99
- Pack of 250 Plasma$19.99
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- Pack of 800 Plasma$49.99
Invader Sisters
No in-app purchases
Questions
Is Galactic Missile Defense free?
Is Invader Sisters free?
Do Galactic Missile Defense or Invader Sisters have ads?
Which is updated more often, Galactic Missile Defense or Invader Sisters?
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