Thanks for the comment, we really appreciate some feedback!
About the difficulty, we started off pretty simple -- with only the temperature stones in the game --, and since we had a lot of time left, we started building on top of that. However, by the end we had something more complicated and harder than we thought, and there was no time left to add an in game tutorial (well, there was about 20 hours left, yes, but it already was pretty late in our timezone and we had college/work the next day hahaha), so thats the reason behind it being a bit confusing at first. But still, you are right, explaining things better would do wonders, and we might do something about that once the jam is over.
And about the cover, we actually thought it was nice, but it indeed doesn't represent the game well... I'm gonna change it to a gif of the gameplay, might be better this way. Thanks for pointing these stuff out, as I said, we really appreciate it!