Hum... so this is a war game. What about making all those sprites a bit smaller. So you could show a lot more larger territory in the same screen? Just an idea.

Your stuff is boring.

It's like a plan. I as no life, no fanzyness. If it's gray, you draw it gray. If it's blue, you draw it blue. That's not art. Art is drawing beautifull things. Things that are fun to watch.

Ok, so if ypou belive I'm right, here what you can do to make this pixel ART.
First, define a light source. This will give you an ambiance you can play with.
Second, change those borring colors into cool ones. A simple way to do this: Your shadow should not be only the same color with less light. It should be the same color with a blue tone, or less saturation.
Third, MAKE IT DYNAMIC! An other view angle could help. But moslty, there is nothing going on in your drawings. BAM! The train exploded! Something intersting.

Here's a quick rough to show you what I mean:

This is the first time i'm really trying to get the anatomy realistic. This is just a rought but I concentred myselft in good proportions and lighting.



What can I improve? Thank you in advance.

Than, your friend won't play this game. 

Thanks!

I hesitate on something, should I make the no-color world zero saturation or is it fine with this brun kinda look?