tl;dr: Not enough H content to be worth the long grind.
Positive:
I liked the game play fine. I'm not usually into "card"-based games, so that says something. I really enjoyed the art style, and the quality of the drawings and animations. The sound and voice was fine.
Negative:
The animations are all very short, and some of them get repetitive real quick as you encounter them many times during a single playthrough. I also think that the three playable characters, despite having very different game mechanics, are all essentially the same in terms of visuals. Big boob small waist etc. The visual character design, in other words, does not have much variety, and as a result, whether it's character 1, 2 or 3 who's getting fucked by her health-tentacle, does not really matter that much, it all looks pretty much the same. That's too bad.
The same can be said about the encounters with the 3 boss monsters. Now these at least are not tentacle-based, they are of the "large beast" variety. More wolf or dog like. That's great. However, again, not that much difference whether you are taken by boss 1, 2 or 3, and also not much difference whether it's playable character 1, 2 or 3. Too bad. More variety would have made this a lot more enjoyable imho.
The most disappointing parts of the game were what I consider "bonus" scenes: the lesbian merchant npc, who can be romanced by each of the 3 playable characters, as well as the reward for finishing the game once with each of the characters. These 4 scenes all felt somewhat undercooked to me. I'm not much into lesbians, so that may be part of it, but the reward scene for beating the game should be way more .. rewarding. (Spoiler: It's essentially the three characters fucking their tentacles again, just this time they're all on the screen at the same time! wohoo..) Why did we bother taming the 3 bosses if we don't get an orgy with them and all 3 girls (and if you must, the tentacle things) as a reward? Come on! What a missed opportunity.
Anyway, this game is obviously high-quality both in terms of the game design as well as the visual crafting. If you like these kinds of card games and you're looking for a game that is just "sexy" without necessarily "getting you there", then this might be 5/5 for you. (The same is true if you can "get there" by watching the same 5 second loop over and over, I suppose).
If, on the other hand, you're mostly using these games as an interactive variant of porn, with the express intent of getting off once per play session, then you might give this a pass.