So far, it's seeming to be quite the good show, though the characters do need to be fleshed out.
Featuring something around Zombies these days can be a drag. So many other projects have had success with the topic and it's left the "market" dry. So you'll want to try to add some things to make your show different. But maybe a few nods to other shows would be a good idea, a few references and maybe even a few stolen and broken down plot points.
Ending each episode on a cliffhanger, as episode one and two have, isn't the best idea. Generally, cliffhangers are an end of a season thing, rather than the end of an episode. So try to end episodes properly.
Using low-quality images like the scope sight in episode two is a sure-fire way to have a bad time. So you may want to take the time to produce your own graphics.
My last point is the leveling and quality of voices. The quality needs to be upped a little, maybe digitally if equipment is a problem. And the voices need to be raised a few DBs.
Other than that, great work. If you can add unique features to this show, I'm sure it'll get more popular.