Quite an interesting game with a potential. I liked it (Scored 4242).
Suggestions:
- Change tank control to other movement, it would make it more intuitive to drive (except if you intended to make driving harder on purpose).
- Timer or indicator for when customer will disapear - had a sammich tossed at a client who dissapeared a moment later.
- Maybe a map of the city (not a minimap, but a map proper) which user can look onto? Have ended up few times in wrong sectors of the town.