I don't think neither the character nor zombies look all that bad.
You did have some scaling problems with the UI, but when working with Unity that's no suprise, that shit's hard! The gameplay was a bit hard to understand at first, but once I gave it a good few minutes I understood how to play.
I assume that you learned a lot as you went, and I just want you to know that it was pretty cool how in 8 days you actually tried your own unique thing instead of just copying an entire tutorial-project from Youtube!
I hope that this has been a good experience for you and that you continue making games!
It's really the best hobby (or job) one can have!