Piggus' Adventure's big update post game jam

After some extra work in my spare time, I was able to update the game to add rebalancing and quality of life improvements:

• New main menu to start the game, so there is no rush to play
• Looping back after death to the main menu
• Rebalanced of both the other pigguses and the knight
• Overhaul of the level design, especially prevalent for the second level
• Some minor bug fixes specially on the visual department.