I think a more detailed tutorial is needed. After the game started, I was thrown into the sea, which left me a bit lost, and then I got killed by a sea monster.
When I finally learned how to click on the boxes, I tried dragging them onto the boat, but they didn't seem to be movable. I used the blue shield attack; the effect was cool, and I was pleasantly surprised when I first discovered it, but I don't actually understand how I used it.