I've watched your youtube gameplay video, so here's my feedback:
For a game made by 1 person this is really impressive. I loved the interaction with the TV and Radio. The Voice acting is very good too. Everbody loves zombie storys, and although it's kinda cliche, if done right it just works.
The only problem is that it's a ambicious project for 1 single person. You really have to improve the animations and I know how hard is to work with 3d models. The optimization of the game is other problem, because even with "simple graphics" the game needs a powerful machine.
My advice is: make a good story, work on the imersion and just make simpler mechanics (unless you find a team).