A nice companion game to Three Houses, I enjoyed the look at an alternate timeline and the differences all the characters experience (at least in Azure Gleam). A fully voiced protagonist is also a nice change, and as a result Shez is way easier to like than Byleth.
As a musou fan I enjoy the gameplay, but it does kinda get repetitive and a bit boring by the end (not helped by it being one of the longest musou games for just a single route). NG+ at least tries to help out by letting you buy an item that lets you skip optional missions for renown, but I have yet to see how well that works in reducing the grind and repetition. The only other minor gripe I have with the gameplay is adjutants seemingly being useless along with guarding, but I'm pretty sure that was just a result of not playing it on hard.
I think any Fire Emblem Three Houses fan should check out this game - especially if you enjoy musous (or at least the original FEW) at all.