Added settings button to the main menu.
For now this allows to adjust sound and music volumes in the game. Ore options might be added in the future.

Update is mostly focused on improving looks of the game and also adds more changes to existing levels.

• 4 new levels and 1 level replaced with something more interesting
  
• added more new hazards and hostile mobs to avoid
  
• added portal objects
  

Adding new content to enjoy.

• 12 new stages to beat
  
• New environments and monsters to encounter
  
• increased size of some smallet planets
  
• imporved some planet textures