Don't have much to say about the game, it looks and sounds nice so far, I'm not into Shin Megami Tensei, but I can see the appeal. The characters are well realized and the writing mostly funny or in character for who's talking.
Issues I had:
I like to cycle my save slots, so I was pressing down then saving in the next one. There was confusion when I got to the end of the list, I pressed down and accepted without thinking, and it quit the game. Once I knew I knew, but to avoid that it may help to make the player press right to select quit, put quit bellow the save files so it's obvious that will be the next selection, or to put quit elsewhere in the UI.
When I got to the first real mirror dimension area, I collected the 2 shield parts before talking to the guy who wanted them. When I did, it seems I'm stuck since I have both shield parts, and he says he has the third one, but he just won't give it to me.