I quite liked this game, nice job! The island itself was really cool to walk around, the day/night system and shadows seem quite ambitious for merely 48 hours, and driving the car around is really fun!
On that last point, I think a really cool way to expand the way whilst still adhering to the theme would be to make only 1 car that you drive around but have to refuel. Like Days Gone!
Really nice game, good work! Your art and presentation is on point with this :)