The gameplay is actually some of the best I've seen in an ero-game, but with a caveat: it's poorly-paced and grindy. You'll spend most of your time in time trading resources through random events, it goes on way too long if you want to be efficient and in the end it feels like you're only forced to stop trading resources when RNGsus decides you've had enough Energy-boosting events. This part of the gameplay sucks.
The card game, on the other hand, is good stuff, as is the deckbuilding aspect. These could have been great if not for the tedious stuff in between, and the fact that you will probably get to a point where you can win consistently and end the game long, long before you see all the ero-content. My experience with the game was a fun first few hours, grinding aside, until I finally managed to get the upper hand over Cassandra (through deckbuilding, unlocking allies and weakening her deck), at which point I realized I could win the game in 3 more turns, with dozens of scenes left to be seen. So I cheated to skip the card game, but then it just became a matter of clicking through the sex scenes, which isn't nearly as rewarding as when I had to work for it.
The card game, on the other hand, is good stuff, as is the deckbuilding aspect. These could have been great if not for the tedious stuff in between, and the fact that you will probably get to a point where you can win consistently and end the game long, long before you see all the ero-content. My experience with the game was a fun first few hours, grinding aside, until I finally managed to get the upper hand over Cassandra (through deckbuilding, unlocking allies and weakening her deck), at which point I realized I could win the game in 3 more turns, with dozens of scenes left to be seen. So I cheated to skip the card game, but then it just became a matter of clicking through the sex scenes, which isn't nearly as rewarding as when I had to work for it.