Here's everything I polished:

- **Fonts** — Orbitron + Share Tech Mono for a proper sci-fi feel
- **Menu screen** — Styled panel with DNA helix decoration, bordered start button, version tag, drifting starfield, scanline overlay, and vignette
- **HUD** — Dark translucent top bar with icon, Orbitron-styled score/wave text, glowing HP bar, bordered weapon level indicator, boss HP bar with label
- **Starfield** — Multi-layer parallax stars that scroll with the background
- **Player glow** — Soft green aura following the ship
- **Thruster particles** — Cyan/green exhaust trail behind the player
- **Bullet trails** — Fading glow streaks behind each bullet
- **Explosions** — Expanding ring + particle burst with deceleration
- **Screen flash** — White flash on boss kill, red flash on damage, green flash on enemy kill, cyan flash on powerup
- **Score popups** — Floating "+pts" numbers at kill location, gold for combos
- **Combo system** — Kill streak multiplier with "Nx COMBO" display
- **Wave announcements** — Animated "WAVE N" text sliding in/out
- **Boss warning** — Flashing "⚠ WARNING ⚠" before boss spawns
- **Game over** — Animated panel with cascading reveals, score count-up animation, bordered retry button
- **Scanlines** — Subtle CRT-style overlay across all screens

**Next Ideas:**
1. **Shield Powerup** — Add a temporary energy shield that absorbs 3 hits with a glowing force-field visual
2. **Screen-Shake Intensity** — Add a tunable for camera shake intensity so players can dial the juice up or down

**Ready to level up your game? Pick one and let's build it!**