Nice, it's tiny, cute and colourful. I particularly love Processing Plant.
One thing I noticed is you use pixel collisions on blocks (keys, plants etc..) while the original -as opposed to pixel perfect collision on creatures- used box/block collisions on items. I keep missing keys lol
Glad you finished your port now because it was in my todo-list (I was considering 8x8 blocks and scrolling but tiny as you did is probably the best option).