Gave it 2 stars because it was different than most games on the site, but has some serious flaws:
When trying to combine 2 things, the 1st one grabbed usually vanishes by time the 2nd is selected, requiring going back and forth a ton. This distracts from being able to focus on what combos I've tried already.
I thought earthquake + water would give me Tsunami (didn't) and water + desert would give oasis (didn't) rain +sun would give rainbow (didn't). After a while, the frustration of having to reselect every time got the better of the fun elements.