It's okay. It's not great, it's not terrible. It's JUST okay.
The "Survive-waves-of-zombies" genre is a dime a dozen, as is the crafting and other survival horror games. It's not terrible, but it's nothing special.
I didn't have any problems with screen lag, There were certain parts that, even with the flashlight, were too difficult to see. It's a surprisingly difficult game! In comparison with a game like, say, How to Survive, however, it just doesn't set itself apart enough to require a full playthrough.
If it's on sale, pick it up. If not, you might want to skip it. If I may offer a tip to the developers - keep going, especially if you're new to development. This shows potential, but just falls a bit short.
Even still, I'm recommending it on the basis that I don't feel like my time was wasted, and I'll probably play it a few more times before I uninstall it.