Gameplay-wise, it's a Minesweeper with some basic RPG elements, like items found in chests and temporary character statuses. This is more than enough to keep your mind busy while enjoying some lewd content. If you prefer games with actual gameplay over another VN or glorified gallery viewer, this is a top-shelf game.
Graphics are cute; cartoonish if not a bit simple, but I'd lie by saying I didn't like it. While encounters are not animated, the game makes up for it with a number of sprite variants. The encounter scene changes depending on your HP, body sensitivity, statuses, if MC's naked or not, and so on. The built-in gallery allows you to tune those values when viewing, so you can enjoy some missed action (although almost all scenes/variants have to be unlocked first).
But for me, the addictive element (apart from the obvious porn aspect) turned out to be in-game achievements. Naturally, they can extend one's playthrough, but I think they are actually designed with a specific goal in mind. Many of them hint, that there are more features later in the game. Some encounters, items and statuses can only be seen on higher difficulties.
Speaking of which, the difficulty curve is a bit broken. As mentioned, this is due to some OP items showing up only on hard difficulty, therefore making normal diff the hardest one.
I've spent way too much time actually playing the game. This is addictive on so many levels. One of my favourites.
Review based on version 1.02