Thank you for commenting, 'dkh'...
About the building roof you commented, i'm not sure if i'd have to change it's bright color... Indeed, the light source comes from above and yes it has the same color with the walls... If i had to change it though, i don't think i used a 'darker grey' as you propose as i fear it would interact badly with the asphalt grey...
... Which brings me to the asphalt comment... In fact, the road is the part i wanted most to be critiqued... Indeed, it could need some overal texturing but i hopped i could just 'MS Paint' the sides and get away with it... Unfortunately, i was caught by at least one person (you, that is)... I have also debated for the stripes opacity and after some testing i decided (as you pointed out yourself) that higher opacity would be distracting from other things...
I do not understand in what strategy you refer to but i hope my previous post
http://www.wayofthepixel.net/pixelation/index.php?topic=6087.msg71262#msg71262 will be the answer you seek...
Would it be a problem if you mentioned the game with the similar pespective you were working on as to have an idea of this kind...?
Thank you again for your time and comments...