Some of it is hard to recognize, try drawing clear sillouhettes and then color them to make it visible what the object is supposed to be (this sentence doesn't make any sense but oh well). Also there's no background, try adding in some landscape and clouds instead of that static blue.

I think you should stick with just one pixel size if that makes sense, the buildings in the background seem "chunkier" than the people, like they are lower res, which in my opinion  creates sort of a confusing look and is not that appealing. Also I agree with everything RedVoxel said. :P

What is your game about?

I'm not sure I can explain, what it looks like to me is that the background buildings have been upscaled while the people have not, It would look better if you had drawn the buildings at the same resolution as the people without stretching them. ^^

How does it look now?

You need a background! Just a big blue "Box" in the back appears to be very boring.

If you are able, try creating a parallax background.

-Sam

^agree (many available) Or even some pixelart clouds could really add to it, I think.

This background already helps a lot to improve the look!

great work!  It definitely looks alot better now!   The gradient was a good choice for the background.  It adds some texture without competing too much with the foreground.