If you grew up on the Super Nintendo buy this game!
The graphics are nothing too special. The GBA could probably do this, but having your stats and the map on the top screen really helps when you're wondering around a dungeon looking for the exit.
You've probably heard it, but the dungeons are all randomly generated. I never found this to be a problem, in fact I kind of liked it because it changed things up a bit when I keep dieing, which happens allot in this game. The difficulty is merciless, but if you don't mind grinding then it shouldn't be a problem. The weapon system is rather interesting. You can add seals to your weapon but if you die all your stuff is gone and you have to start from scratch so be careful.
Over all Izuna is a great game. It's worth the $20 price tag because of how long it is. Go pick it up and give it a try it's fun and well worth the money.