hmm
well the ideia is good, it had no SFX however they some times are not needed, but its kinda weird to play, you get no clue wether you are hitting the zombies or not, the dont flinch, sparkle or whatever, and then they just kinda disappear... also when u die u just get warped to the beggining of the stage...
nice game, nice concept, it may become great but there are some things you must take care of, good luck ;)