If you want a movie with a lot of good animation, go for it, this one is full of that, but as an adaptation it fails in a lot of ways, this is not just an "ok" adaptation, it's essentially a 20 lines essay about a 200 pages book, so the plot might be confusing, the characters be much less interesting than what they actually are, and yes, even the fights mostly lack in comparisson to the original material, so for the true experience i recommend to check out the Visual Novel.
Aside from that, if you don't actually know the source material, you might have a pretty good time, visually it's great, soundtrack is cool as well, the plot is still pretty good since the original material is amazing, but it's still like comparing a casual breakfest to a complete Christmas meal, it still has a great taste, but far from the real deal.
