Nice work! I like the day and night concept, especially once you start mixing in creatures that are both nocturnal and diurnal. That's when the puzzle element of switching between the modes really clicked for me.
I also enjoyed the overall presentation, nice work!
I don't know if it was just me, but I did find myself wishing my character's hit box was just a little bit smaller and more forgiving. There were a few times where I died from probably just barely touching a bat, but my eyes couldn't keep up with how small a fraction of error it was on my part. But again, maybe this was just me.