Nice additions
You're still missing tunes though lol Oh and zombie noises, that'd be pretty cool to hear them groaning and snarling and stuff.
Some new terrain would be pretty awesome to see as well, maybe set ups with varying pathways and even multiple areas where the zombies are coming out of so you have more than one place to be having to watch over.
One thing I especially like about your game though is it's a type where you can just get up and leave for a few minutes then come back and see how you're holding up lol It's a good thing too cause I kept getting phone calls in the middle of playing lol
But while it has that convenience it's also a downside if you can actually sit and play for a good while cause the game isn't all that interactive.
So, good job with the additions and I would love to see another release with more sound work and interactiveness!