1. When player kick and punch sprite 13 will spawn at image 1 of kick animation, when Sprite 13 spawn and colusion with enemy, they will die. and at the beginning of lvl, i make every 0.1 second sprite 13 destroy to make sure that the sprite13 don't effect the other enemy when player don't kick, 0,1 second enought to kill one enemy when kick and the other come closer don't die if not kick... Oh my god :))
2. Pin behavior is very useful, you should learn it here first .http://www.scirra.com/tutorials/243/building-a-platform-game-a-beginners-guide/page-1
When you already learned this tutorial you'll know what "pin" is.
3. I make this game for 2 day... first day for graphic and animation and second for coding.
4.ofcourse, and when enemy hit the sprite 13 ( mean kick), they will fall and slip on the ground at random distance.