Yeah, lack of any choices is pretty disappointing as well. It's ok not to do a game as complex as Couple's Duet of Love and Lust (for that you really have to think forward and have very clear vision of what you want to achieve), but some choices, albeit somewhat cosmetic, would be nice. There were some choices in the previous versions but now the game really is just a kinetic novel and it get quite a bit boring. I bit of inspiration from Exciting Games would be nice - choices there doesn't really affect the story, but give players whole lot of options to see stuff they are interested in.
With the cliffhangers it seems to me like the author is doing them on purpose because he thinks he's actually rewarding those that support him (they won't matter when the game is finished). Find such thought more than a bit weird, but what do I know what majority of people think.
Difficult to design a game that involves everyone, we cannot expect that our tendencies are correct and those of others are not.
I mean that users who follow my same evaluation logic regarding story (with a minimum of accumulation and more or less that makes sense as far as a game of this type can be), characters (milfs and other non all rendered as perfect dolls and variety of characters by age and behaviour), good level animations (with different pose and angles and sexual actions even with clothes on and in unexpected situations), sounds and music (important factor for me) and for lastly the main thing is the update timing (if it exceeds the month it becomes difficult if not useless for me to follow).
I have no skeletons in my closet and therefore the tags have no value to me (I hate vanilla stories and prefer conflict).
Everything else regarding the gameplay type: choices (if not excessively tangled that take away the immersion), sand box with reward systems and more that can improve the gaming experience becomes an icing on the cake, but I can do without it.
To conclude, in my point of view and others that follow the aforementioned logic, this game respects the main canons of a porn game (for me it is unique compared to what you find here) and deserves to be supported but most seem to not think so for the moment, although, I think the financial support obtained so far is not insignificant and destined to increase especially if the dev works with improvements regarding sounds, music, rendering, animations and by shortening the release times or increasing the contents for each release (as anticipated by him in the objectives to be developed).