I played last DD so the game isn't that different. I found this graphical bug when setting the game on fullscreen. Also, I think settings are not saving so the screen size and music volume have to be set up again each time.
I'm impartial to the new character designs. I think my least favorite one is the furry barbarian because he weird me out a little bit while the knight wearing a completely ineffective scarf over his metal plate is the most endearing.
I also can't seem to find any logic in the unlock order, it's not like the dog is any more complicated than the rogue. Losing a bunch of times gets a bit tiresome too since new characters are the biggest source of variety during the first few rounds of each game.
Finally, the placeholder music is quite pleasing.