Hey the game is very cool! I think it has great potential and it is addictive. Perhaps you can add some more weapons, for example a bomb to throw, or larger size zombies who are slower but harder to kill..
Thank you for your comment, I'm pleased to announce grenades and one new weapon has been added. To throw a grenade press and hold tap where you want to throw it. To switch your weapon, simply press the new weapon swap button! Hope you enjoy the updates! Let me know what you think.