Public alpha build

This is the official alpha build for the game

• the UI and Menu' s have been updated and reformed to be more direct and user friendly. 
• Mouse controls are no longer required, every on-screen button has a corresponding key. 
• 2 new upgrades have been added to the shop menu.
• In order to make it easier to control your spaceship you can now hit 'S' to brake and go backwards
• You can now press Escape to instantly exit the game