More balance attempts and HARD MODE!

Balance the times of the levels because some levels are too permissive
when it comes to how much time you have in them in normal difficulty

Add hard mode

• Starts with 1 life
• Reduces each level's timer that is over 5 seconds by 2 seconds
• When you reset the level you lose 1 life

Update some levels to not include 1 block gaps
Change level 3 completely to have a better difficulty increase
Change the last levels where you run in straight line to include some blocks

some formatting of files

• Add new line at end of each file
• Remove trailing spaces where there are any

Add polish to the looks of

• Main Menu
• Game Over
• Game Win

make sure that when lives reaches to 0 game ends instead of -1

Add fade out effect between scenes