Bottom Line

# 🧟‍♂️ BottomLine: Endless Zombie Defense

**BottomLine** is a mobile-first, endless zombie tower defense game built with **Phaser 3** and packaged for Android using **Capacitor**.

Defend your base, upgrade towers, defeat bosses, and survive increasingly difficult waves of zombies.

---

## 🎮 Gameplay Overview

* Zombies advance through **multiple lanes**

* You **place and upgrade towers** to stop them

* **Boss enemies** unlock additional lanes

* Difficulty scales endlessly

---

## 🧠 Core Mechanics

### 🛣️ Lane System

* Up to **9 lanes**

* Unlocked progressively:

* Level 1 → 1 lane

* Level 2 → 3 lanes

* Level 3 → 5 lanes

* Level 4 → 7 lanes

* Level 5 → 9 lanes

---

### 👾 Enemy Types

| Type | Behavior |

| ------ | ----------------------------- |

| Walker | Balanced base zombie |

| Runner | Fast, low HP |

| Tank | Slow, high HP, attacks towers |

| Boss | High HP, unlocks new lanes |

---

### 🏗️ Towers

| Level | Type | Description |

| ----- | ------------- | ------------------------------ |

| 1 | Basic | Balanced attack |

| 2 | Rapid | Faster firing |

| 3 | Heavy | High damage |

| 4 | Explosive | Splash damage (AOE) |

| 5 | Laser *(WIP)* | Planned continuous beam weapon |

---

### 💰 Economy

* Earn **tokens** from kills

* Use tokens to:

* Upgrade towers

* Bosses give **bonus rewards**

---

### 🧟 Boss System

Bosses appear at increasing thresholds:

```

50 → 100 → 200 → 400 → ...

```

Defeating a boss:

* Unlocks more lanes

* Increases difficulty

---

## 🖥️ Screens

### ▶️ Start Screen

* Game title

* Instructions

* Start button

### 💥 Gameplay

* Real-time tower defense

* Lane-based combat

* Scaling difficulty

### ☠️ Game Over Screen

* Final stats:

* Kills

* Tokens earned

* Bosses defeated

* Retry or return to menu

---

## 🛠️ Tech Stack

* **Phaser 3** – Game engine

* **JavaScript (ES Modules)**

* **Capacitor** – Android packaging

* **Android Studio** – Build & APK generation

---

## 📱 Android Build

### Requirements

* Node.js

* Android Studio

* Java JDK

---

### Install dependencies

```bash

npm install

```

---

### Build web assets

```bash

npm run build

```

---

### Sync with Capacitor

```bash

npx cap sync android

```

---

### Open in Android Studio

```bash

npx cap open android

```

---

### Build APK

In Android Studio:

```

Build → Build APK

```

---

## 🎨 Assets

* Custom zombie sprites (walk + death animations)

* Tower sprites (5 levels)

* Explosion effects

* Forest/apocalypse background

* Custom splash screen and launcher icons

---

## 📦 Project Structure

```

src/

├── main.js

├── GameScene.js

├── StartScene.js

├── SummaryScene.js

android/

└── Capacitor Android project

public/assets/

├── zombies/

├── towers/

├── effects/

```

---

## ⚙️ Key Systems

* Lane-based enemy movement

* Enemy lane switching (random adjacent)

* Tower targeting with rotation delay

* Cooldown-based firing system

* Splash damage calculation

* Boss progression logic

* Token economy system

---

## 🚧 Roadmap

Planned features:

* 🔫 Laser Tower (Level 5)

* 🧪 More zombie types:

* Spitter (ranged)

* Mutant (mini-boss)

* 🌊 Wave system

* 🔊 Sound effects & music

* 💾 Save / High score system

* 📊 Game balancing improvements

* 🏆 Achievements

---

## 🐞 Known Issues

* UI scaling may vary across devices

* Balance tuning is ongoing

* Some animations may need optimization

---

## 🙌 Contributing

This project is currently in active development.

Feel free to fork, test, and suggest improvements.

---

## 📜 License

TBD

---

## 👤 Author

**Erwin Galang**

---

## 🎯 Final Note

BottomLine is built as a **fun, scalable tower defense foundation** with room for expansion into a full mobile release.

Survive as long as you can.

The zombies don’t stop.