Vampire Hunting = extremely addicting (and normally vampire games are stupid)
The game is about 10+ BUT you have to replay stages (and there is always a hidden room for new challenges) in each stage and they have a really rare item, OR NEW WEAPON, to find. So if you think of it this way it is almost basically 20+ hours.
They have a lot of sweet anime video clips (that don't last long but still sweet) in the game. The music is very good and catchy, and it does not bother me at all, if it had some lyrics or something I would probably add it to my ipod because the song is so catchy (not as catchy as zelda) but you get the point.
The bosses, I am disapointed in them, because you can easily kill them if you use IRC transformation by sucking their blood over and over, BUT some bosses are hard and cannot get hit by IRC effectively, which means no easy kill for you and you will have a challenge. If you don't use IRC on bosses then it is a good challenge for you, because they are very hard.
At the end of every boss you will go off to space and play a 3D Shooter game (like starfox) and you use the stylus to drag/move your ship. you can use elements like fire for backup missles. the space shooter mini games gets harder and harder.
You can buy items, buy equips/armor, upgrade swords, sell items, level up, basically every thing an RPG has.
the graphics are 2D but who cares, SNES games OWN XBOX (no offense).
the multiplayer I have not tried yet but you can battle other people.
THE END