i really liked the design of the level, having that nice castle almost always in view kept me wanting to get there and solve some spooky mystery.
my monitor is 60hz, and the turnips got ejected into the ocean as well.
textures are too noisy from far away, did you try using anisotropic filtering?
for me the whole shift - click - drag thing didn't feel necessary, but were also intuitive enough so i was not bothered by it