In all technicality the score I would put would be more 4.3-4.5/5. Now, I think this is a great game. While the story is pretty basic, it's put together pretty well. I think where the game really shines though is it's characterization. I never felt the characters were very one note. Going through other games, even ones considered pretty good, I always felt the character weren't too interesting. Like they would be hot and they have lovely base personalities but they never felt like there was too much more to them. DoD somehow manages to make me interested in most of the characters. Like early on, I wasn't really interested in Tracy at all but as the story unfolded, she slowly become one of my favorites. Other characters like Alice and the Mother while not too focused on by the end, always felt like you can really feel how the felt in some scenes. I think this also helps that the rendering is amazing. There may be other games that have more interesting character designs but not a lot if any are as detailed the ones here. It's not just that they look beautiful, it's that from the knees to the neck, or the feet to the hands are so detailed.
Now as much I could say more great things about this game, there are some parts that are pretty lacking. The music is one thing. While it does manage to set the mood of the scene, it kinda becomes bland as you go though the story. The actual sex scenes while very hot, are a little clunky still. They may go back to fix this by adding real animations later but as of now, pretty lackluster.
Now slight spoilers of the ending bits. You'll likely see people talking back and forth about if the ending was good or not and for me, the endings are great... Storywise. Some will say it's rushed but I personally didn't really think so. It might be that I didn't over expect anything (like I mentioned earlier, the story is pretty basic) but it seemed pretty good... Now I do have issues with them though. As eluded to, storywise isn't the issue for me, it's the ending sex scenes. Now that may sound a little silly but let me explain. They just seem too short and generic for what they are. A giant victory. Your character beat the bad guys and regardless of any taboo, everyone is accepting of any relationship you may have with them. So why does the last scenes feel like nothing had changed from the previous times you had sex with them? You're free to live and do whatever and the scenes just seem... tame? I think the one that suffered this the most is the Harem ending. While still a nice scene, it doesn't seem as grand as it would imply. It seems lacking. The Bad End and Corrupted end are actually fine though. Your character isn't in control so you losing out seems fine. Side note though, I do say that but I wish there was more with Evil Alice since man, Alice is my favorite and how the sex for that could be just ticks a giant checkmark for my personal fetish... ahem. Anyway... The story factor of the ending is great but I do see why people would be disappointed and at least for me, it has to do with the lack luster sex scenes for the endings.
So yeah, the game is great and will likely stay among my favorites. It has some issues to work though as they go forward but as a first project, I'm excited to see what more they can come up with.