I've already finished playing version 0.20. In my opinion, the game is fine. The negative thing I'd say is the same mistake most of these kinds of games make: adding filler characters that no one is interested in. There are like 100 demons in the mansion (which makes no sense in this anime's story) and we already know what the problem with this is: the Devs make filler content for these characters that no one is interested in, only to give little content for the characters everyone wants, in order to raise the hype. For example, in this last mission, wouldn't it have been better to give time to Zeniko instead of the demon? If there were a survey, 70% would say they prefer content for any hunter instead of a demon that we only saw for one chapter. Let's say the game is in good health and makes it to the end, put Douma in the mansion and have Shinobu accept it? It's porn. But a minimum of coherence wouldn't hurt... in the "evil" route this isn't so much of a problem since you're the "bad guy" and you do what you want, but in the "good" route there has to be some coherence.
Don't make the same mistake of completely forgetting about a character after reaching 100% in a relationship, and moving on to another character. That's why it's not a good idea to have too many characters at once; none of them will have enough content.
Although it would have been nice if the white haired girl had taken all the demons to a hiding place and the MC could visit that area. But I don't think this game will change. I just hope it focuses on the main characters from the anime.