Because this is your first build I wanted to give you some solid feedback (or share my feelings at the very least), but mostly I just wanted to share how much I enjoyed playing Cor! :)
The opening was unique and it grabbed my attention right away. The dialogue flows easily and each character seems to have their own voice which is FANTASTIC.
So far the game has a lighter tone and it's really easy to pick up and enjoy. There wasn't a huge infodump at the begining. Thankyou!
The sprites are cute and expressive. I really liked that you've included the main character sprite, i always love it when VN's include the MC. (Though initially I was a little confused as to who it was... It would require extra work but perhaps you could include a frame of them staring at their own reflection to introduce the player to the MC's sprite.) Faust and Hector are especially cute.
It might be a good idea to include some 3/4 turned character sprites during group conversations? When everyone is facing forward it can be a little monotonous, but the art style here is super cute, and character expressions change frequently so it's not a huge issue. :)
The soundtrack is definitely not your conventional generic piano VN soundtrack and it works really well! Sound often feels like an afterthought in a lot of games and it works to both set the mood and keep each scene feeling different enough from the last.
While the dialogue is great, I would consider maybe breaking up the longer sentences into separate lines? Or at the very least do so on the mobile builds.
Whereabout is Cor set? (Europe? Americas?)
Definitely looking forward to the next build!