The inability to figure out the true size of the characters makes it difficult to figure out what I'm doing wrong. I can't tell if it's my fault or not so I end up blaming the game for a mistake that could very well be my own, but I wouldn't know if it's actually my fault or not because I don't know the size of basically anything.
Also, everyone's, but especially Sana's, hair makes it hard to see smaller characters underneath them. I'd recommend putting each dropped or merged character up a layer from the previous one so that I can see my Ina's under my Sana's hair.
Overall, I'd say it's a great game, but it has a few glitches and general rough-around-the-edges presentation that could be touched up.