I enjoyed the graphics! The pixels/jagginess were nice and clean, I liked the underwater palace level when the windows were visible to the outside. Had a good ambience with a legit bit of fright for the run sections! I also enjoyed the couple details you could see, like the snake/dragon coiling around the planet, the underwater creature you end up running from showing up in the window, and the deer creature rising from the ground. I got through pretty much the whole game by just trying to escape without using any other defend mechanics and I only used items twice to heal, but I like the idea that you are just trying to escape, and not fighting back! And even though I got through it without it being difficult, sometimes the enemy encounters are too constant. I had the same problem in my game though too! (I just read that you adjusted the rate depending on the darkness, which is actually pretty cool, but maybe still a little less would be better!)
Overall, good atmosphere, good sounds, good scenery, fit the theme well, and just the right length!