Wieder-ienvasion (Space Invaders)

Wieder-ienvasion v0.5.  Space Invaders clone. 

There are five power ups. There is the Health Pack to restore one heart. There is the Shot Gun that allows you to shoot three lasers for 15 seconds. There is the Rapid Fire which doubles your fire rate and it lasts for 15 seconds.  There is the Homing Missile. The Homing Missile well it shoots a freaking amazing heat seeking rocket and it lasts for 15 seconds.  There is a speed boost which doubles your speed. 

There is also a leaderboard that shows the top 10 players and their highscores. 

If you have any suggestions for updates add a comment. 

I would suggest full screen mode for this game.