I would describe it as a mostly-linear First Person dungeon delver, with a Phantasie style combat (sorta similar to classic F.F. I guess) with a very strong magical fantasy theme.
I enjoyed it enough to finish it, and have almost all the secrets too, so that's over 40 hours, assuming you're not using a walkthrough.
I got it as a bundle, and it's now one of the better parts of that purchase imo.
BTW, RE: Chryssalids. Long War don't play if you use some of the difficulty settings.
Every terror mission thus far has a pack of at least 5 that will encounter you enmass in the 2nd or third turn. They have a high chance of mitigating partial damage even in the open, and few weapons hit as hard as they did in vanilla. Barring exceptionally good reaction shots and many multi-attack capable soldiers, you're gonna lose whomever they congregated around, and probably a couple others, since they couldn't move completely out of range, and still provide damage output. And if you're the kind that spreads out really quick to prevent a swarm from hitting more than one person at a time, well, now you have two more groups of floaters attacking you, in addition to the initial group and the Cryssalid pack.. The aliens will generally actively move towards your landing site or last announced position, unlike vanilla, where they were almost always idle. This all only gets worse if you use the variable damage output option, and end up having many rounds of only a couple damage combined of all the aliens due to armor absorbing your low-roll hit. (IMO though. My luck is regularly very awful.)
Oh, and that close combat trait only triggers one/round now
So much for that defense.
Suppose that wraps up this edition of N9103's Walls of Texts