i added a big ship: its red, it means you can fire it from any direction. power ups are not red but they contain green. like this one

power up: currently there is one power up added to the game: its a black circle with a white and green in it. you will know when u see it. it destroys all the enemis on the screen so it can help you to get out of sticky situations. ill later on add a power up that gives you back health, and an other type of ship that if you hit it, it will stun you for 3 seconds.