Come on guys, I'm disappointed. You have plenty of time to dodge the aliens appearing 'on top of you' - just watch the screen.
Boleslaw, no never seen "EV Nova"
Bug Fix: When you click off the screen the game won't throw you in to the side any more. (Although you still lose control - Flash can't update its keys when you've clicked off the play area!) Just hold down the mouse button or select autofire from the pause menu if you don't want to click off screen accidently.
Lots of useful info there guys. I've uploaded a new version which fixes some of the issues.
1. Made the player movement less sensitive.
2. Capped the frame skip (the chatroom was causing havok with my code) so it shouldn't be so jerky.
3. Made the effect when an enemy is appearing brighter: You should be able to see it better now and dodge out of the way.
The ship flying against the side problem is caused by pressing a direction, clicking outside the play area, then releasing the direction button. Sot sure how to fix this at the moment, but for now don't click outside the play area - you can hold down the fire button so you shouldn't need to click, and also you can select autofire from the pause menu.
Thanks everyone for your comments.