A hint for anyone and everyone: Don't bother wasting crystals on anything but the x2 option. You'll often get higher dps weapons and you won't feel like an idiot when your legendary becomes quickly outdated.
There's a bug where random enemies will get stuck on the side of the map (although you don't need to kill them thank god) as well as random enemies that you can't hit on the map.
Something that would be cool is instead of having a spell on the bar for however many pieces have that spell, have the spell more powerful or better yet have the mana cost reduced.