The left one is mine ^^

I am a little late, but this definitively needs comments, THIS IS THE BEST looking metroid clone I have seen (trust me I have looked and looked). Hope it will get finished. 

Okay so I'm still working on the ennemies AI and I'm quite satisfied of what I've done, mainly for ennemies sticked on the wall, even if it's a simple code. Indeed this is mainly checking all possible cases when there is a direction change to do I've rewroten my samus animation system for the Art_of_Camelot sprites, and I've optimized a little my tilemapper. However I wanted to know if a fast 3 or 4lvl grayscaled 16*16 tilemapper is doable for my game, and if it is, where can I find a source or an example of it ?

Uhm..It's definitely possible. The only thing is that fast scrolling gray can look like crap (For examples of this, see screenshots of Project M and Ash:Phoenix) But the code would be something like
x^16->s
y^16->t
y/16-ytileoffset->u
x/16-xtileoffset+mappointer->v
for(a,0,6)
for(b,0,4)
if {u+b*mapwidth+v+a}->c
16x16sprite(a*16-s,b*16-t,c*64+spritedatapointer)
end
end
end
Whoops, is this project in axe? I don't remember..Well hopefully this will help you still; and note it can be optimized further still

If you are still working on this, I think it might be best to not use grayscale for the time being. It's not very necessary and you could ask help if you need extra monochrome graphics. I hope  you still plan to finish this at one point.

Also you should ask programming help in the Axe section, because many programmer never check the project topics.