The perfect Run

Movement: A and D /<- and ->. Space to jump. R to restart. You can kill enemys by jumping on them. When an enemy is killed the way to another enemy is opened. The game restart, after 30 seconds or if the player dies, or if the player presses "r".  There is a "boss". This is my second game ever, and I made it on the last day. I hope you have fun playing it.