Yeah, it's that Thank you !

Edit : Added missiles. Working on the exploding animation

Did you try adding that gravity system i showed you about?  Or is that still in the works?

well it already has gravity I was just helping him with physics and adding a more realistic gravity system

Working on that

Okay, so I think it's better for you to see the screenie before reading
I've a problem of optimization : to allow to me using grayscaled backgrounds I am forced to draw each tiles 2 times instead of copying the buffer to the backbuffer after drawing what made me many slowdowns... Is it possible to draw each tiles 2 times (buffer and backbuffer) without using 2 times the Pnt-off command and without loosing speed

Edit : it is more or less two time slower on the real calc but wabbit seems to have corrected that lag
Is there a way to make the background scrolling two time slower than the character without loosing significant speed too ?

This looks even better.   I especially love the HUD. One suggestion I have to improve speed would be that every 2 frame you absolutely draw nothing at all, not even Samus or the HUD. That may not work if your collision detection is pixel-test based, though.

Wait, why are you drawing your sprites onto the backbuffer in the first place?  Isn't your map monochrome?

Yes, my map is monochrome but I wanted to be able to draw grayscaled background without drawing each tiles on the 2 buffers

Wow, that looks awesome!  Great job!  I really like the background.
You could always do this:
1.) Draw all the sprites on the front buffer
2.) StorePic
3.) Draw the background

I think I can't because my tiles aren't totally black and background will probably cover them...
But copying the bytes of each tiles drawn on the buffer to the back buffer isn't fastest than using the sprite command to draw them on the back buffer ?