It’s okay not to like it of course. As you have seen it’s nothing like the Trine games, sharing only a bit of lore with them.
It’s basically a very pretty arena-based top-down shooter reminiscent of Magicka (which I also loved), with a good difficulty curve. There is not much of a story to carry the game forward, so it hinges on whether you like the gameplay and the challenge it offers or not. I for one really enjoyed Nine Parchments, doing multiple runs in single player and co-op with friends (even a “hardcore” one, which we usually never touch).