High quality, wholesome, and fun. A fantastic erotic sandbox.
Aurelia doesn't do anything new. It's your standard harem sandbox. Move between locations on a static overworld map, exploring different content available at different times of day. Visual novel style dialogue where you flirt with every girl you meet. Complete fetch quests and minigames to improve your relationships and unlock sex scenes.
What makes Aurelia special is it does all of these things consistently well, never once fumbling into the usual missteps that plague the genre. And it manages to keep this up for hour after hour, with dozens of characters and what feels like hundreds of sex scenes. It's easily one of the most polished and well crafted erotic games I've ever played.
I will admit, Aurelia isn't the best at anything. There are games which are sexier, or funnier, or have better story or characters or gameplay. But few can pull all of them off at once, and almost none manage to do so better than Aurelia. That said, there's a few specific aspects I think are worth special mention.
One is the gameplay. Aurelia has heaps of different mini-games, and even the simplest of them are pretty fun. But some of them have a surprising amount of content and depth, and are fully engaging in their own right. At some points I was looking forward to the gameplay more than the sex. There's even a simple but effective RPG-like stats system, with levelling up, equipable items, and power-ups, which ties in to just about every single mini-game. Impressive stuff.
The other thing I appreciated in particular was how straightforwardly wholesome the game is. While it can be fun to explore darker kinks in the safe space a game provides, too many porn games just passively accept or even promote toxic relationships and behaviour. In Aurelia, your character is a horndog, but is never rude or pushy or entitled about it. He doesn't pester any of the girls, and always waits until they reciprocate his flirting. Sex is sought out and enjoyed by both parties, and he actively works to fulfill his partners' physical and emotional needs. It's refreshing to have a game clearly show what healthy intimacy looks like.
Overall, a rare combination of quality and quantity. One of the best in the genre.