Hi,
This project looks very interesting. I have experience in Unity and Android.
I have few Arduino projects behind me:
- Arduino Photo Trigger, which was my solution for triggering camera with array of sensors ( lasers, IR diodes, sound, touch ),
- Arduino meteorogical station - used Nokia 5110 screen and SD card to log data received from temperature and moisture sensors
- Laser turret operated with mouse ( fun for cats ).
For all of these, i wrote everything from scratch ( except 5110 display library ) and deployed on Arduino Duemilanove.
Also, i have experience in Unity as you can see in my portfofolio.
Please, note that my bid is very rough, because i don't have ideo how complex your project is, what kind of sensors you will be using, which Arduino, etc....