Game jam minor fixes

Here are a patch for minor changes based on some feedback from playtesting: 

• Moved the camera 64 pixels up, so GUI under the player is always visible.
• Removed a bug that would make the player stick while jumping very low onto an edge.
• Made it possible to hold down left or right and jump buttons and jump instead of continuing to only move.
• Tweaked a level chunk that used to be impossible to traverse in a specific combination.
• Fixed a bug when the pipe insect sound would continue to play if they get killed.
• Now plays transformation sound effect also after transforming back from big to small.
• Now possible to quit the game from the win screen.