I like that some elements have their own properties and float and such, makes them feel more distinctive. I just coulnd't figure out the combinations, as I didn't know what most of the elements were. Also, holding SHIFT all the time ends up being a bit unconfortable. It's OK for a short game, maybe I spent way too much time jumping arond holding an element, but I would be nice if we could have a toggle between holding and releasing.
Nice presentation and nice concept!