Dude. This game is cool. Please keep working on it. I think you could put an interesting spin on an RTS tower defense like game. The zombie aspect is what makes it unique. I think it has a lot of potential.
Some suggestions:
- Better visually differentiate humans vs skeletons (they look like skeletons with clothes).
- Implement scrolling when touching edges (zoom was good but kind of slow when this game becomes faster paced).