The pacing is a little weird to me, the building/gathering phase lasts a lot longer than I wanted it to, and I got a little bored of it. I realize that I can skip to the start of the storm, but that wouldn't be optimal strategy, so I didn't want to do that. I ran around my house in the storm, thinking I just needed to survive until the end of the storm, was wondering why the first wave lasted so long, and eventually there were so many mobs around my base, all my structures were destroyed. It wasn't until after reading the comments here that I realized that I had to destroy crystals!
I really like the rain effect and the thunder though, and the use of the theme. The storm phase is intense! And the metal music gets a big plus from me!