Congratulations on finishing your game, Ace X. Great job!
The sex scenes are insanely hot. You've done an amazing job on the animations. And the minigames are solid; classics for a reason. I also enjoyed the writing and the story, basic as it is. You do a good job adding some intrigue and mystery, even though the succubus twist is pretty obvious early on.
So yeah, I'm a fan!
If you don't mind, a few things I think could still use some improvement. (I'm leaving these comments here rather than as a review since I figure they're tweakable in any future updates):
The audio adds a lot to the animations. Having more different clips would always be nice, but I think the biggest thing would be to not use the same voice for Ivy and Piper as for Val.
The main game mechanic is rather confusing. I'm sure there's some logic to it, but it's never properly explained in-game, and feels pretty arbitrary. Cumming sometimes means you die or lose the game, sometimes that you have to replay the stage, sometimes it appears to have no effect and you just continue or retry the step, and sometimes it's how you progress to the next level. I've completed the game and read the walkthrough, and I'm still not sure I always understand what's going on. I think if you had a bit more exposition or straightforward explanation around this, that might help, and maybe some clearer feedback about what has happened and why.
I think part of the problem is that the "cum points" are hard to keep track of. As far as I can tell, they're only displayed while you're playing the minigames and trying to beat the timer, so you rarely have a good chance to look at them. It would help a lot if the display was also there during the dialog around the scenes. And maybe displayed graphically somehow (like a bar filling up).
I also tend to think the minigames are a little bit unbalanced. The sudoku is pretty quick and easy (at least in the 4x4 size), Breakout/Brick is easy but takes way too long, and the puzzle is usually doable as well (though can be challenging on the higher levels). However, while Memory is OK when it's only the two-card match, in the 3- and particularly 4-card versions the timer is much too quick. Just finding all the 4 cards in a set often means flipping most of the cards before you can begin trying to match them, and unless you have perfect memory for everything you've seen there simply isn't enough time. It doesn't help that many of the images are very similar. I think you should extend the timer for these by maybe 50%, or even double it to make it playable.
With the heavy penalty for failure, save-scumming becomes pretty much a necessity, unless you want to replay the same stages over and over each time you slip up. It would be nice if the game would just give the option to retry in these cases.
Finally, there are quite a few typos (things like "yuo" for "you"; also it should be "sudoku") and mistakes in the text (mixing up "your" and "you're", for example). Some proofreading would really improve the professionalism of the production.