Thanks guys. Gogetax, can you post your specs please, I don't understand why your fps drops sometime, on my two computers (the 2nd is a 2 years old laptop) things are running fine.
Things I have to code:

3 or 4 more levels with news ennemies.

New weapons, and other features like a time limited invincibility.

Main menu.

A better animation when player loose.

Better big explosion for boss.

Space key for bomb for mice with only 2 buttons.

A better player damage system. (with 5sec invincibility after been hit)
This will take 2 weeks I think...