# Gemini: Space Tower Defense — Build, Upgrade & Defeat Bosses

> Build, Upgrade & Defeat Bosses (iPhone/iPad app by Blue Rain.)

- Source: https://appshunter.io/ios/app/gemini-space-tower-defense/id6815485390 (this page in markdown: same URL + `.md`)
- Developer: [Blue Rain](https://appshunter.io/developer/373016486)
- Category: Games, Strategy
- Price: Free with in-app purchases
- Age rating: 17+
- Requires: iOS 15.0 · 653 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-10-05
- Data updated: 2026-10-24

## What is Gemini?

Build your last line of defense against an alien invasion. Gemini is a sci-fi tower defense game where placement, weapon combinations, and upgrade choices shape every battle.

PLAN YOUR DEFENSE
Spend battle gold to deploy towers before each wave. Combine laser fire, freezing shots, flames, sniper rounds, and missiles to hold back advancing enemies.

EVOLVE YOUR ARSENAL
Use earned score in Tower Lab to improve your towers. Adjust your upgrades and combine different weapons for the threats ahead. Zoom in on the action and choose when to call air support.

FACE THE INVASION
The full campaign spans nine planetary sectors with distinct terrain, enemy abilities, and powerful bosses.

FREE TRIAL AND OPTIONAL PURCHASES
Play sectors 1–2 on Normal difficulty free. A separate one-time campaign purchase unlocks access to sectors 3–9, with sequential progression still required. Fel difficulty with the Poison tower and Void difficulty with the Thunder tower are separate one-time purchases; neither includes the campaign expansion or the other difficulty. Complete all nine sectors in Void campaign mode to unlock Endless mode. Buying Void alone does not unlock Endless. The Holy tower unlocks through its free tutorial. Restore purchases from Settings.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Campaign: Sectors 3-9 | $2.99 | one-time |
| Fel + Poison Tower | $1.99 | one-time |
| Void + Thunder Tower | $1.99 | one-time |


## Is Gemini safe?

Not enough ratings yet to assess Gemini.

## Is Gemini legit?

Gemini: Space Tower Defense appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Gemini is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.3 — 2026-10-22

GeminiDefense is now Gemini: Space Tower Defense.

• Clearer crowded battles: persistent enemy ability halos and Fel/Void effects surrounding enemies are hidden. Their gameplay effects remain active.

Your existing game progress and purchases are retained when updating this app.

### 1.2 — 2026-10-17

What’s New in Version 1.2

• Closer, Clearer Battles
Combat now zooms in automatically. Pan across the battlefield, zoom up to 2.1x, or return to the full tactical view.

• Improved Tactical Controls
New camera icons and an interactive minimap help you locate threats. The tower toolbar folds away during combat for a clearer view.

• More Challenging Bosses
Bosses have increased health and gain stronger damage resistance with each campaign appearance. In Endless Mode, each boss assault grows tougher.

• Strategic Air Support
Start each battle with one airstrike. Earn an additional strike every 20 waves completed in Endless Mode.

• New Victory Presentation
Celebrate each liberated planet with boss artwork and animated effects, then head to the next planet’s briefing.

• Cleaner Battlefield
Removed enemy health and shield bars to reduce visual clutter and keep units visible.

### 1.1 — 2026-10-06

What’s New in Version 1.1

• Added a startup loading screen with progress indicators.
• Added a step-by-step tutorial for selecting towers, placing defenses, and starting your first wave.
• Added swipe scrolling and smoother navigation in Tower Lab.
• Updated the Start button icon for clearer battle controls.

### 1.0 — 2026-10-05

No release notes.

## More apps by Blue Rain

- [Next 5](https://appshunter.io/ios/app/next-5/id6752849995)
- [平安无事](https://appshunter.io/ios/app/id6758050746)
- [GeminiDefense](https://appshunter.io/ios/app/geminidefense/id6761719774)

All apps by Blue Rain: https://appshunter.io/developer/373016486

## Related topics

[geminidefense](https://appshunter.io/ios/topics/geminidefense)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-24.*