I got a review copy of the game, but all my thoughts are unbiased. My full review can be found here (it's long lol): https://sonicnancyfan.wordpress.com/2019/09/13/otome-review-heavens-graveblackcr...
I'll just copy pasta some highlights of the most important parts of my review, and add some more thoughts.
The game can be summarized really simply: walking>camping>catastrophe>repeat
All of the routes follow this format, which makes them feel very much the same. Now this has some downfalls and some benefits. The biggest benefit is that the player gets to see Arha and her guy interact almost constantly. This allows for character growth and for feelings to grow as well. The biggest downfall is that the same things keep on happening over and over again. Most of the game takes place on roads or in forests, so though there are a lot of backgrounds, they’re usually really similar (like multiple backgrounds of a forest), so we don’t even get a change in scenery that often. One town gets destroyed in one route, and in another route, a different town gets destroyed. But in the end, it's basically the same thing for the player since we have no connection to either town.
The characters sit at campfires so much, they actually have sprites for sitting down XD.
The endings are also all very similar. The good ends are similar to each other and the normal ends are similar to each other. Since there’s three guys, the events in the ends kind of triangulate among them, and even after only seeing one ending, I feared the others would be about the same, and yep, I was right
I didn’t really like any of the endings? XD I suppose it’s the nature of the game, but I wouldn’t consider any of the endings actually “good,” at least if I interpreted them right, and considering all the endings are basically the same, that made me not like any of the endings. I’m very much an “I want an absolute perfectly happy ending” person, so I went in knowing I probably wouldn’t like the endings that much, and the game is clearly not happy from the description, so I can’t fault it for its depressing endings.
Kien is the unspoken OTP. His route has the most romance, the most chemistry, the spiciest CG's, and sexual content. Tai and Suiza barely have any. Tai and Arha have some slight chemistry in their route, but Suiza and Arha really don't acknowledge their feelings until super far in. Kien's route feels the most like what you'd expect in an otome game route.
Arha has sass and doesn't take crap from people, which was great. I really enjoyed her as a character. All of the guys were fine. Tai's route felt the most boring to me since most of his drama was him feeling conflicted over not being able to take charge in such a terrible situation. Suiza's route was full of sass, which was nice, but it also wasn't very romantic. Kien's route sucked up all the romance and hoarded it, so I enjoyed his route the most, and I felt they had the most chemistry.
As for play order, I would recommend Tai>Suiza>Kien. This leaves Kien for last and starts you out with the most boring route. Plus, Tai and Kien’s routes share similarities in some parts, so breaking them up is nice.
If you enjoy apocalyptic stories or otome games that have a lot of plot (at the expense of romance), as well as don’t mind how sad it is, then this game would be great for you. For anyone who wants a light-fluffy game, first, the plot description should be enough to know it’s not lol. But I’ll confirm; it’s not. This game wouldn’t be for you. If you want your otome game to have happy endings (beyond the MC and her guy getting together), then this game also wouldn’t be for you. It is a great take on an apocalyptic story that isn't set in a future setting though. I don't see that very often. So if apocalyptic stories are your jam, then definitely check this out.
As someone who generally prefers my otome games to have a lot of plot (even at the expense of romance), but, also wants happy endings, there was only so much I could enjoy the game. All the guys were okay enough, the plot was fine, and some of the journey was fun, but much of the game was ruined by my dislike for all the endings.
So would I recommend the game? If you’re someone like me, then no. If you view a happy ending as needing more than just the MC and her guy getting together, then this game, and most depressing otome games, are not for you. But, if that doesn’t bother you, then there’s an interesting plot and fun characters set in an (eventual) apocalyptic world.