did you just say you leveld up in the first world till you where in lv 30? in that case, noob! ofcourse it's easythe game is really easy on proud mode. because if you defeat the first boss on all the characters you can go back to that world and buy all the lvl 1 magics fire,blizzard etc then just stay in that world until you can get third lvl magic spells which doesn't take that long at all. the game is really short too because i lvl up to lvl 30 before i actually started the story and it only took me 5 hours to complete right up to the last boss for each character. so you have to set the difficulty for yourself do you want to get good commands at the start or do you just want to stay at a low level throught the game.
I hope it's hard but it seems pretty easy, I start on proud mode and if that's easy I play the other charachters on critical and if all charachters gotta be on the same savepoint for some reason I re-play ven on hard after Terra and Aqua