Played it to the end, quite an enjoyable and complete experience! (:
I was a little confused at first when I actually take damage. Mainly because I didn't understand that the trails the purple goops leave behind damage me as well. Especially when they leave an item, my instinct was to immediatly rush over and pick it up, which led to me touching the still remaining trail and get damaged.
Aside from that, I had a smooth experience so really nice job!