Contrary to what other reviews have said, I think the game is fantastic - I never had any issues with the game. It's very much like an old school style arcade game which I love. I also had no issues with lag in the jump either and the machine I'm using is atrocious! I think it's people's lack of skill. ;)
The only thing I would say as it was probably the reason I've had to leave it for now is that I switched to the cleric and the only way to turn back to the Warrior is to reach it again further on. I think this could have been probably combated by having unlockable pedestals at the start of the journey for classes you have unlocked.
Besides that the graphics were superb and I really enjoyed it!