Pretty neat little game. I'd love separate keys for passenger drop and missiles though, I keep dropping the buggers all over the place, bit masochistic. :D
I do believe the great engine here, with that cool scrolling and basic setup, could be used to expand this into a fully fledged "Crash Smash" thing. Maybe add some extra mechanics/objectives, stuff like having to slow down to collect passengers or else they get rammed into the water/killed, different levels/maps, having to refuel the chopper, time limits with a counter to achieve objectives, assorted/random events and/or secondary objectives, etc. Just some ideas. Cheers!