Looks nice - but I can't even solve the first puzzle :)
I thought the following seems to be the right combination, but it doesn't move on to the next level.
| fire | water | |
| water | fire |
Hmm strange... Did you put the right elements on the right spots (fire in the fire, water and fire to form steam ?) I guess my game could have used a better tutorial to explain the rules, which is unfortunate since one understands the rules, it forms fun puzzles.

Anyways thanks for giving my puzzle game a try ;)