Hello guys,
I'm working on a platformer game for mobile devices, the game will be divided in two scenarios: the sewers and the city. I think the sewer sprites are ok, but I'm having some difficulties making the city's walls, ground and platforms.
Here are the sprites:
 
seems to me that the color and style doesn't fit together, need some advice.

Link to the game (only sewers implemented): www.jordyadan.com/dtadz3

Thank you