If you liked Torchlight or Dungeon Runners, you'll love this game. And it's portable too which is awesome.

At first I wasn't sure if the group of people you randomly group up with were supposed to be fighting together, separately, or what the deal was. Almost seemed like it was a free for all but because of the hardware limitations they limit it to 5 people. But now I realize it's a group effort for a reason and it seems like people generally understand that it's best to stick together. For the most part you'll do fine solo, but it goes much faster when you group up. I also like that if you wanted to play either by yourself or just with friends, you can lock out people who you don't invite.