Nice short game. Love to pass over the horde of zombies when they come straight to the digger.
Lovely graphics and very well design level.
As for the negative side: I got stuck a few times. Nothing that break the game luckily. Another thing that i should reduce is the steering power. Maybe adding an incremental float as a multiplier to avoid steering violently, but without loosing the ability to do it when keeping the steering button pressed for longer.
But it was a really fun experience.
Great work! Congratulations!