I've created an enhanced gravity garden puzzle game with all the requested features:

**Core Mechanics:**
- 🌱 4 plant types with unique growth patterns and oxygen generation
- 🌍 9-directional gravity control plus zero-gravity mode
- 💧 Resource management (water, energy, oxygen)
- 🎯 Progressive level system with increasing oxygen goals

**Plant Types:**
- Basic Plant 🌿 - Fast growing, low cost
- Space Tree 🌳 - High oxygen output, branches heavily
- Gravity Vine 🌱 - Very fast growth, long segments
- Crystal Flora 💎 - Expensive but maximum oxygen generation

**Visual Features:**
- Starfield background with twinkling stars
- Gravity field visualization showing force direction
- Organic plant growth with branching
- Particle effects for oxygen generation and events
- Dynamic leaf generation on branches

**Gameplay:**
- Click/tap to place plants (costs water & energy)
- Use directional buttons to change gravity
- Plants grow following gravity direction
- Resources regenerate over time
- Complete levels by reaching oxygen goals
- Zero-gravity zones appear in later levels

**Mobile Support:**
- Touch controls for plant placement
- Responsive UI layout
- Optimized button sizes for touch

The game creates a unique puzzle experience where you must strategically place plants and manipulate gravity to maximize oxygen production while managing limited resources!