Online leaderboard, new planes and plane upgrades!

Big  update after a game jam. Fly through the skies, evade floating islands, destroy enemies!

Added:

• Online Leaderboard
• Player money
• 3 new planes: Lear Jet, F-15, Ornithopter (from Dune)
• Added planes upgrades: HP, Fuel, ammo, Rotation Speed
• Added new original soundtrack
• Saving between sessions