To reach the avoidance, you have to get past 7 gate jumps. You can save after getting past each of them, so I doubt that anyone with more than one day of fangaming experience will get stuck there. After that, it begins.
The boss is a duo of Miku and Rin (Plus 1/5 of Len). Like most of the avoidances, it mixes RNG and pattern through the fight. There are a lot of troll attacks and some of them are horribly fast. If you get a fast troll attack that has RNG on it, you'll probably want to get the best possible RNG, because if you don't, you'll most likely be killed without having the chance to defend yourself. The pattern attacks are also fast, sometimes, but they'll probably be the smallest of your problems after a bit of practice.
The last attack ruins everything. Not only it's a terrible surprise, but it's also far too luck-based. I remember getting there once, after spending a long, very long time suffering on the avoidance. Happy I was. Then I died. It wasn't fun. This game would probably have 10 points (Maybe more) less on difficulty if it wasn't for this attack.
The split-screen gimmick is very cool. I wish it was used more often on this avoidance. Overall, this is quite low on my list of recommended avoidances, but if you wish to try it, and don't mind on dying a lot, there isn't much harm to it.