So for my overall impression of the game. I enjoyed it.
It isn't some masterpiece of porn, but I will admit I've never really been able to enjoy most porn games. Evenicle is the only one I REALLY liked, others are tolerable, and thinking about it Subverse actually kinda has a lot of the same vibe as Evenicle does, which is probably part of the reason I enjoy it.
The space and ground portions of the game are simple, but its a porn game. I've already seen people complaining that many of the space/ground battles were too hard. So making them actually super difficult would just get in the way of enjoying the game. Compared to RPGmaker games it isn't as boring, and compared to other porngames that have you do minigames like "pull up weeds" this is actual enjoyable gameplay.
On one hand I understand why some people don't like the porn scenes not being integrated into the main narrative, on the other hand, one of the biggest problems I've always had with porn games is wanting to see a character get railed in a specific way, but because that wasn't the way the plot went it never happened. This honestly opens up far more possibilities for ways for the girls to get fucked, which is why I'm playing these games in the first place.
The writing, characters, and general tone, is very laid back, and refreshing compared to how many porn games try to act like they are some hard drama, when they aren't. I can just sit here an enjoy the game.