Game references of images

fly -> http://vector.me/search/fly-fishing-cartoon
background -> https://storybookstorage.s3.amazonaws.com/items/images/000/102/962/original/CartoonGrassHill01.png?1433120873
cloud_sky_1 -> https://ak6.picdn.net/shutterstock/videos/11381252/thumb/1.jpg?i10c=img.resize(height:160)
play_button -> http://ageofcavemen.com/wp-content/uploads/2016/02/button-300x176.png
power -> https://s-media-cache-ak0.pinimg.com/originals/20/9c/cb/209ccbcdd28e8cf0974cd224b1e86066.png
dead_sound -> https://www.freesound.org/people/pfranzen/sounds/377157/
grave ->https://static7.depositphotos.com/1001911/718/v/950/depositphotos_7184612-stock-illustration-cartoon-grave.jpg
keyboard-keys -> http://www.101computing.net/wp/wp-content/uploads/arrowKeys-300x205.png