So, I like the concept of this. A school where you have to get married to graduate is kinda wacky but fun. I liked the idea with the stats, lessons and the mini games, but I just felt like it didn't really live up in the execution.
I didn't play for long, so I didn't see any holidays or events that might have combated some of this criticism, but if you can't hook people from the start it doesn't matter what cool stuff you have later game, so here goes with my feedback;
You go on dates with characters, but you don't actually see them. You don't get to talk to the characters or learn about them, you just have to pick who to start romancing based on the intro. With all of the stats, it does feel more like an rpg than a romance sim. (I haven't played a lot of otome games, but I'm pretty sure they're based a lot more around character dialogues and choices.)
I found it incredibly tedious to walk back to my dorm, sleep or study, then walk out of the dorm and back to school each day. Sometimes, that took longer than the actual days events. Your maps are a bit too big and boring (or a sample map,) so it wasn't interesting to travel, and that's the main reason I quit playing. I wasn't having as much fun as I thought it should be.
Some quick fixes you might want to look into;
The tiling error on the walls above all of the doors can be fixed with shift click mapping. (Tut is Vx Ace but it's the same method.)
Tsukiko and Miku have the exact same face apart from their hair. You might want to change the eyes/nose to make them more unique.
In the fortune telling class I was awarded a B and a C.
I went out with Rin and Miku too, but my relationship only went up with Kazuki.
So, I'm sorry if that came out a little harsh. I can see what you were going for, and I do like your ideas. I think you might just need a bit more experience in making a rewarding player experience, and the best way to do that is to just keep making and getting feedback! If otome games are something that interest you, you might want to look into the visual novel genre instead, I think it's a bit better suited to developing deep character relationships.
Hope this helps :)