normal mode's enemies fire as soon as they detect you while hard mode's npcs try to shoot at where you are heading (which imo makes hard mode easier than normal mode if you abuse the time slowing effect)
i couldnt get past the first password (i know the answer is 649 from the previous rooms- 6 for the amount of dots, 4 from the maze, 9 from the button room)
each character has their own playstyle ronin uses Smoke Bomb in place of most others' ability to swap with people, while Push combos really well with his spear
spin x7, bee, fire at random location when unequipped, shot speed, bonus damage for extra energy, AOE, knockback, fire with a 45 degree spread, and another shot speed