21 Days: Galaxy Guard
Casual In-app purchases Contains ads
Defend the interstellar front lines!
- Downloads
- 5K+
- on Google Play
- Price
- Free
- In-app purchases
- Updated
- May 18
- 2026 · v1.0.3
Screenshots
About 21 Days: Galaxy Guard
Endure 21 days to secure humanity's last hope!
Faced with endless alien legions, can you survive to the end? Forge an unrivaled star army and strike back against the invaders!
As a space commander, choose your buffs carefully, construct unique facilities,train your allies, and lead an unstoppable expeditionary corps!
→Join "21 Days: Galaxy Guard" today and wage your interstellar defense!
Faced with endless alien legions, can you survive to the end? Forge an unrivaled star army and strike back against the invaders!
As a space commander, choose your buffs carefully, construct unique facilities,train your allies, and lead an unstoppable expeditionary corps!
→Join "21 Days: Galaxy Guard" today and wage your interstellar defense!
Alternatives to 21 Days: Galaxy Guard
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| App | Rating | Price | Installs | Last updated | Compare |
|---|---|---|---|---|---|
| 21 Days: Galaxy Guard | – | Free | 5,000+ | May 18, 2026 | |
| Backpack Fights: Battle Master | 4.6 / 5 | Free | 50,000+ | Apr 24, 2026 | Compare |
| Zombie Check Up Simulator Game | – | – | – | Apr 7, 2026 | Compare |
| MechCom 3 - 3D RTS | 3.8 / 5 | 1.99 USD | 10,000+ | Oct 11, 2025 | Compare |
| Gem Rush Survivor | 2.5 / 5 | Free | 10,000+ | Nov 14, 2025 | Compare |
| Knights College | – | 12 USD | 100+ | – | Compare |
| River Raiders: Retro Arcade | – | 1.99 USD | 50+ | Aug 5, 2026 | Compare |
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