I know I'm not the author, but being as it's been a month I thought I'd pipe up with my thoughts.
I first came across this game a year ago, but I'd forgotten the name and had it on an old laptop that the screen broke on. Remembered the game a few days ago and eventually did enough digging to find it once again.
The game released on Steam 4 years ago, so I would say that the game probably, at this point, won't become free to play, at least not any time soon. However (and if the author ever sees this they might be inclined to know about this as well, in case they want to take action against these) there are some free downloads you can find online fairly easily that are safe downloads.
I used one of these first to test the game to see if I'd like it as I have a similar policy (if I the games do not have a free demo), and then bought the full game. Honestly, it's 10000% worth the money as the game has a decent length of story (I think my first playthrough took me around 5 or 6 hours but I was taking my time with it, as I usually do). A fair bit longer than most eroges/H-games you see out there.
Tbh, I'd have been happy paying £20 for this game, but the fact it's £12 is a good price! Definitely recommend this game if you ever do break your own policy once ^-^