Ok, finally I have an idea. Thanks to Squidi's so-called GameDocs, PacMan's birthday the day before yesterday and my true zombie-love I have a plan. I decide to design everything for Nokia 5800 XpressMusic (with 360x640 resolution) with very simple reason - that is one my neighbor have so I can test my game on it.
I use simple map editor I write before, initially for my first FaceBook Snake (where I finally never use it), used later in Eastern Compo Game. I made 7x10 map of 50px height tiles, what gives me up to 90px on the bottom of the screen for navigation panel (coz that device had no keys). Now I have to find someone who can make me some graphic.