Ok, so...
I just finished playing both Nana and Aria and this review stands for both.
Firstly, I really appreciate your games, I was a big fan of "Beyond Darkness" and "Remember death", and I liked these sequels too. They still have some flaw that can easily be adjusted, but I think you also improved something (sprite quality, and if I recall correctly you also adjusted text speed).
One suggestion: since these kind of games rely mostly on dialogues (well, it's almost ONLY dialogues), it could be helpful to use different colours for the dialogues of different characters: white for Nana, pink for Alice, and so on (making them match hair colour could be a good choice). This way we can focus on "acting dialogues in our heads" without having to read who's talking each time.
Also, I appreciate visual novels with choices but the first two choices were totaly irrelevant for the story, so it sounds a bit like you're cheating ;)
I give "only" 4 stars because I liked the atmosphere and the story of "Remember death" a lot more (I found those animal masks, that changed every time, to be very original and unsettling). Not that I didn't like these two games or their stories, but I found them to be more predictable and a little less original in the atmosphere.
Anyhow, I think they're still very good and you should be proud of your work. Looking forward to enjoing your next game/art :)