Thanks for taking the time to play our game and giving feedback. We planned to add more powerful weapons with limited ammo. We also planned to have the zombies target and eventually open the closed door on the upper floor but we ran out of time to implement it. I believe your game to be The World Gem. The game itself is fine but you either need to shorten the opening cutscene or a way to skip it (Or if you can skip it make clear how to do so).