Ok, I am not a pro-gamer so I don't think I have figured out how to stay alive for more than three days... HOWEVER, I really liked the idea (and the trees becoming enemies and vice versa was amazing). If you had more time (like one extra day), I would appreciate some "easy mode" so that the day would last longer or the enemies would be slower (but that's just because I keep on getting killed like this).
Overall, a really nice game. Maybe the font chosen for the time-change was a bit strange (didn't really fit the overall vibe of the game), but that is a really small thing. The controls were nice, the music was thrilling and the idea was cute.