By the way, everyone dying at the end doesn't always make a good ending. Actually, it usually makes quite the opposite of a good ending. Not that it can't be done right, but it's hard and usually should be avoided, especially if its done just to do it.

Furthermore, if you must make the RPG turn-based at least make it an innovative system. Turn-based RPGs are slowly going out of style because eventually people get bored of it. RPGs aren't generally known for their utterly exciting gameplay style, and I would hope that a more action/skill/strategy-based system would work out better than just the standard everybody-line-up-wait-for-bar-to-charge-then-start-slashing style.