The author credited "Pick Up the Phone Booth and Die" as an inspiration; the format overlap is evident, but this one's more lovingly described and also has a reassuring score system to let you know when you've discovered everything. Catnip to a multiple-endings-aficionado such as myself.
For a lark, I tried putting together the possible actions in a natural flow. There are a great many variations with which one could approach the game, of course, but some endings suggest other endings, so here's one list.
(Spoiler - click to show)Crash
I
exit
fly
wear sombrero
get tape
open glove box
X severed head
call 999 (or 911, if you prefer)
X windows
X forward
x rear
take guitar
sing
X side
turn off radio
listen harder
take pencil
wake up
push button
X odometer (mileometer does not work for this one)
wake up