If you already got the hang of it and feel like that, I highly advise you put the game on hard. The enemies pretty much wont do anything but mostly stand around otherwise.
Unlike a lot of games, difficulty doesnt really affect stats of mobs in musou, like it doesnt double the enemies hp, or def, or damage done, it just turns on their AI.
I actually only just realised their were different difficulties.
I've switched to hard and it is much more challenging, especially when facing bosses like volga who are surrounded by swarms of enemies.