I have some thoughts; I'll try to avoid a wall of text:
Overall, this game is great. The artwork and CGs? Amazing. Some of the writing? Stellar.
But note I said 'some' of the writing. For some characters/situations, you managed to capture the feel (or I prefer to say, the 'vibe') of Helltaker very well; but for other characters and situations, I think the vibes fall flat.
Which did you do well at? Malina was perfect, Cerberus was great, I loved the direction you took Justice, Zdrada was great, Azazel was good, Lucifer was good, and Pandemonica made sense.
As for characters that I believe you did not fully capture the right feel or tone in this game:
1. The Helltaker himself: His portrayal in this game seems to fall on a lot of typical Japanese dating sim tropes. To take one example: when Modeus - a demon girl he explicitly went to Hell to bring for his harem - undresses CONSENSUALLY before him, why on earth would he avert his eyes? He's a grizzled dude who looks like if Johnny Bravo joined the yakuza, who walked into Hell to get a crew of sharply-dressed demon girls to fill his house with (both sexy and absurd) shenanigans - he's not an shy anime protagonist embarrassed by the lewdity around him.
2. Modeus: Modeus is a demon of lust. She straight-up (as shown in the comics) watches metric tons of pornography and seeks to reenact those scenes with randos at the gym/pizza delivery people/etc. Why on earth is she being bashful at being taken out on a date by the Helltaker? (Remember that she approaches 'romance' as a strange mega kink - she should be afflicted with The Big Horny).
3. Judgement: Judgment is experienced and wily. She may be bombastic and theatrical, but that's part of her role as High Prosecutor. She's not some borderline-tsundere who thinks a caterpillar is a deadly intruder; remember that in the comics she's one of the mature ones (along with Lucifer) who keeps the other demon girls in line and maintains order.
Sorry if my comments came off harshly; I do really appreciate the game you've put out and the effort put into it, and many of the writing choices. I just believe that it could be improved if the above comments are borne in mind.
Thanks for reading my wall of text!