Your first game ? Keep it up :)
I give this an 8 since it was your first game, really nicely done, beat it on my first try with 4-5 co-survivors, ak47 and chainshaw the best combo :) it was a little dark though and when zombies gathered up it was really hard to aim. It would be nice if you could equip your survivors and you could also give them stats like aiming, ability with machine guns/pistols/shotguns/bravery ( at how much % of barricade dmg they will run away)/good at finding other survivors/good at finding weapons etc and these stats could increase after each day.. Could also add an injury feature that could reduce these stats, perhaps could add healing in the daily activites or search for food etc... another thing that bothered me was that when there were too many zombies, the game run slow.. In general, nice going lad, keep up the good work :)