First of all, thank you for playing and I'm glad you enjoyed it!
To answer some of your questions and comments:
Allar is meant to be a yandere, though I don't think I portrayed it very well in the game. Despite him being insulted and mean in his Dark bad ending hes still attached to the MC and plans on keeping them personally!
I'm working on an update to the game in order to add some bonus scenarios in the future which will take place after specific endings! So hopefully that will fix my lack of proper writing for Allar then.
(･o･;) " My bad.
Moving on, the first game is completely no canon to the second! They were in college not highschool for that game, as I don't plan on making characters who are underage, that would limit what I can do with them way to much.
Which leads into...
All four of your love interests in this game are in college! Which is how they're all connected generally. They all met either through their general classes, or through other friends who haven't been publicly posted about yet. The eat your heart valentine games were meant to be a fun silly side thing for the series I originally planned, which I haven't gotten around to making yet.
Although, I'm a bit confused as to what you're referring to with Micas outfit? I would like to note that Mica is just short and small, he's 21! Or are you referring to his binder?
As for all of your other questions, feel free to ask them on the blog listed on the game page if you can! As that is where most of the bonus facts and information are posted about all of the characters! It hasn't been updated in a little while since I've been burnt out and busy with work, but I would be more than happy to answer your questions there and update it.
ヾ(･ω･*)ﾉ Sorry if this wasn't detailed enough! But again, thank you for playing and being interested in the characters!