Hello!
I really like the stylish cityscape, especially the "beveled" look of the clouds. The text has a lot of character too, but some characters could be more consistent with eachother - "i" is definitely too fat and the characteristic parts of "w" are a bit too skinny.
The character/skelleton is unfinished(or he seem so, at least) - since the light source is to the top right, the front of the skull and chest should be a lot darker. The side of the skull looks weird too - anatomy wise, and lighting wise too - the dark shadows give me an impression that the skull "curves inwards" a bit too much.
Quick google search for some ref material:

Since it's still wip, comment about a lot of empty space may seem unnecessary - you have a lot of space for more undead!

Hope it helps, I like the gameboy vibe it gives very much!