yes (ending spoilers) spoiler (click to show/hide)
The final boss kinda sucked. I thought there was a trick to it, like you kill his clones and his shield drops. so I tried trapping him in a force field, kill those two and he'll still spawn more inside the forcefield. eventually I realized you have to brute force him and it's pretty lame because it's not balanced well for close ranged fighters. so chug buff potions, spam health and resurrection, and that's it. the preceding fight(s) were more interesting encounters.
there are also a few obtuse puzzles and cheap encounters (teleporting you into a room of enemies) but overall the game is excellent.
I still need one more crystal for the final elemental sphere. :'(
I was stuck on that too. If you want a hint spoiler (click to show/hide)
stop looking for it