I really wanted to like this game, I really did. However, I feel that the people behind this game decided to emphasize the grind of "Orange Trainer", whilst minimizing some of the best parts of that game - the dialogue and corruption.
Yes, technically the art is an upgrade from 'Orange Trainer', but that game had fantastic art already as well as dialogue and scenes that really emphasized the slow corruption of it's main character.
Both games suffered from a unnecessary gameplay mechanic that was just grindy, but 'Orange Trainer' didn't really take you away from the immersion of the whole point your playing a Trainer game - corrupting a strong-willed but innocent woman. The reason I felt 'Paprika Trainer' took you away from the main purpose of a trainer game, and thus the immersion, was that it had missions that you have to perform, that are tedious and not that fun, and for the most part, don't have a great pornographic payoff (especially Trainer-wise). In 'Orange Trainer', it was only really the command centre (money cheat solves this) and some 'fetch' quests (that could be skipped with CTRL), whereas in Paprika you actually have to play the quest. They're boring and they're take longer to finish.
That's my main issue, but I also felt that the dialogue wasn't on the same par as 'Orange Trainer' because it was more humorous and light-hearted, taking out some of the darker side of 'Orange Trainer'. For me, I play Trainer games to corrupt a strong-willed and innocent woman. Paprika has elements of this, but once again 'Orange Trainer' does this better, especially because you're focusing mainly on one woman.
I wouldn't warn people of this game by any means, because it is well made overall and others may enjoy it, but if you're a fan of Akabur's classics (Witch & Princess), then 'Orange Trainer' is a real contender, and arguably better. I feel, for my own personal tastes in a Trainer game, the people who put the effort behind this game, took away the wrong lessons from their previous title. It just doesn't hit the mark as well.
Obviously, taste is subjective though