The monster density out in the "world" could be improved. It would be nice if there were more monsters and more monsters that are closer together. Instead, we have like only 6 monsters in a small area on the maps; and they are spread super far apart. If you are not grinding in Ash Keena or any other dungeon(s), it would take 10000000 years to get a +1 level.
Improvements to be made:
Increased monster density
Increased monster spawn timer