TODO:

• Collectibles - fuel, gems
• ship uses up fuel
• Buying ship upgrades for gems (shop menu!) - better engines (speed boost), guns (for shooting metheors), upgraded fuel tank (can hold more fuel) (upgrades visible on model, affect ship stats)
• destroying meteors by shooting
• HUD (life, fuel, time left)
• particle system on collision
• Disintegration effect when killed
• Fix shader bug
• Parallax effect
• Compiling for mobile