(This review corresponds to the .5 version of the game. If the download you're looking at is something like 1.0 or later, please ignore this.)
I'm not familiar with Firebrands, so I can't tell which For The Honor game elements are new full stop and which are simply new to me, but the design here feels really fresh. "This game is a series of minigames" being said outright isn't something I've run into before, and I dig it, even if the minigames are sort of just expanded versions of what Moves are in PbtA.
This is definitely more storytelling game than tactics game, so for folks who want crunch, this may not answer that need.
That said, the setting is big and messy and dramatic in a cool and polished way, and the minigames are written to support that, so if you want a game about strong characters having feelings at each other, this definitely will do that. It also leans very easily towards romantic fantasy, which may be another reason to pick it up, but it also doesn't expressly require romance, and it gives optional rules to forbid it.
Overall, I think the only spot that felt missing was NPCs. In FTH, they seem more like momentary props that you pick up and speak through during a minigame, which makes minigames like Stand United feel a bit off. Unless there's a major NPC that the whole group is taking care to incorporate and build up as a villain, it seems like it'd make more sense to Stand United against another PC, and I'm not sure that's the intended direction of the game---even if FTH does work as a very solid mechanical foundation for a pvp story.
If you want something story-focused, non-random, PC relationship-focused, and you like the mood and energy of the source material, I think you'll enjoy this a lot.