It seems interesting. It took me a -long- time to figure out what to do. Not sure if this is the order you intended, but first I had to drag something onto the middle bottom squares (which do nothing again after this sequence) and then two white squares appeared on the middle left just below my 'elements' then I had to drag something from my elements onto those left hand squares...Dragging things onto the bottom center squares did nothing after the start.
The physics is really floaty, which could be good but in the basic demo here it felt a little weird. It was fun to try out the spells, but I need -way- more feedback when I did something right because it felt like things only kinda worked some of the time and I'm not entirely sure what I was doing wrong (or what I was doing right when it did work alternatively).
Good job overall though, definitely something that has promise.