Honestly, a surpassingly average game all around. The game itself is super-linear, but the plot is engaging enough (nothing truly surprising, but it's not entirely generic), and the writing isn't horrible.
It could definitely stand to be about half as long, though. The game really starts to be a slog around the time you reach the forest and enemy hp balloons. I also wasn't a fan of the H in this game - it's almost all noncon that features the main character in pain, and none of those are avoidable. I can only think of three that were, and ironically, those were the ones that the girls actually enjoyed to one degree or another.
The sex attacks in combat were a complete waste of time, as well; without any kind of scene progression, and pitiful damage, they pretty much just waste the enemy's round and your time. They should have either taken them further, or cut them completely.
Ah, and as a final note, the translation is surprisingly decent, though there's plenty of times where the text ends up running past the box. I wouldn't call it great writing, but I've seen native English speakers write worse dialogue.
Incidentally, it's rare for a game like this to inadvertently make the demon king more likable than the goddess. At least he feels bad about raping you (until Walter talks him out of it), while the goddess condemns you to an endless hell of rape if you decide to give up on your mission upon facing a literally unkillable enemy. Not to mention how she told you pretty much nothing useful before dropping you in the slums. And made it so you can't tell your best friend about your time loop powers to prevent her from running off and getting killed. And didn't think you'd succeed to begin with, so seriously, why is she trapping you in hell for giving up?