Here's some feedback on your game:
1. The theme
Wow, really excellent idea!I like the switch between day and night and overall the idea. A more in-depth tutorial would have been good though, because i don't really know why to save the villagers or how to really defend myself.
2. The gameplay
The controls feel really smooth and polished, The game was also really fun, like shooting enemies and saving villagers and everything. But i came to the problem that i built walls around myself and then i was stuck XD.
3. The Graphics
The graphics are actually pretty good, you chose a nice color scheme and the trees and the crafting table look great. The zombie and player needs some improvement though.
4. The sound
The sound and music is perfect. It really sets the mood and fits perfectly. There is a big stop between the music of the day and the night though.
With longer day and night cycles and improved gameplay i could really see this being a great mobile game!
I hope my feedback helped you a bit. If you have some time, it would be nice if you checked out our submission too. Thanks! :)