Everything. Really. The story and gameplay are both top-notch and play into each other near flawlessly. The cast of characters is great and I always want to go around and talk to all of them after a run, whether or not they have nothing new to say. While the soundtrack might not have any songs I want to listen to in my off time it all fits the game so well that I enjoy it just for that.
Artemis. Best god, I'll fight you.
How fun the twin fists are to use. It's like they dropped a high tier fighting game character in as one of the weapon choices and hardly anything in the game knows how to deal with that.
MartinFF7:
Everything, just to add on what Shonen_Bat said. I'm just so impressed they took such a simple concept (doing the same thing over and over again) and really made it an engrossing, entertaining experience. The characters, the dialogue, graphics, music, gameplay... I'm just really impressed all over the place. Everybody was hyping it up to me and I didn't believe it but now, really understand where everyone was coming from.
This is such a minor thing but it's one that's sticking with me right now. One of the possible quotes when you beat Hades is "Charon...take me home". The tone or the way it's delivered, the sense of resignation... something I hope I hear every time I beat him, even if it only ends up a fraction of the time. It's such a little thing in the grand scheme of things but I love it.
My completely broken strategy of Aspect of Zeus with Ares Special, Dire Misfortune (doom boost), and Charged Shot (Bull Rush fires projectile). I got so good with manipulating the shield's movement around the field, Blitz Disc dooming everything in sight, pretty well invincible in final battle, beat 20 Heat without breaking a sweat. By far my favourite weapon & aspect to use (Aspect of Chiron 2nd best and working up to 20 Heat on that one)
Epyo:
The fancy visual effects on the weapons.
I have a crush on Megaera.
The jokes that appear at the top of the screen each time you present the food to Cerberus.
Emeraldegg:
Everything about the writing stands out the most to me. The voice acting is tremendous, the quality of the writing is great and relatable (Zagreus slipping up sometimes and saying inappropriate things is something people do sometimes) and the amount of dialogue in the game is just tremendous. I don't know how many escape attempts I'm at but I've beaten all weapons on at least 7 heat, one at a time upwards and I'm still getting new dialogue.
The way they slow feed you new things throughout the game, even after what seems like a long time, really keeps a good taste in your mouth of "oh man I wonder if there's something else I still haven't done here?" It really helps to offset the nature of the game which done not-well has the potential to just feel really repetitive. This is not that at all.
Raka_Putra:
That feeling when a combination of boons work together really well
Zagreus
How smooth and responsive the game is
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Into the woods, but mind the past... Into the woods, but mind the future!