Small GFX update

My girlfriend told me that my hearts looked like mickey mouse heads. 
This is primarily because I was upscaling a small version of a heart because of inital time restrictions.

Changelog

• Updated the heart graphics.
• Added a small visual explosion when clicking a heart.
• Added waterfall & birds sound.
• Improved the heart confettis.
• Added SFX when the confettis explode.
• Added a pause menu (Esc)
• Added a progress bar filling up with love
• Added lose & win condition (You must fill up the love bar else you lose :c)