Knights in the Nightmare is pretty good Hail you could give that a shot, its a pretty good mash up of Bullet Hell and RPG.
I want to add that you should really try to pick this one up new, as I think it comes with a CD with some music from the game on it.
I keep going back to Shiren the Wanderer (a rogue like/mystery dungeon game)
Hells yeah! That game defines pain and misery! Gave up on it when I died in the Golden City due to a malady of status alignments.
It's the most hardcore rogue-like on the DS, way more so than those pansy Pokemon Mystery Dungeon games.Picross
is definitely a keeper if you're into puzzle games, it's long, challenging, addictive and hard to resist once you get into the groove of it. Has a huge number of puzzles and the option to make your own. Lacks graphics and sound, but it's simplistic looks work with it and you would more often than not neglect the music for your own.
A quick, fun, overwhelmingly adorable romp; Dragon Quest Heroes: Rocket Slime
, part Adventure-RPG, part Mech battles. In the A-RPG part, you gather items (Practically anything) which can be used as ammunition for your mech. As well as the slimes you meet can help you run it, three max at a time. What sweetens the deal is that they have different characteristics, as to what they would do if you enlist them. The mech battles are the highlight, bombarding the enemies' mech and then breaking in to destroy the core... That alone should be a good enough reason to purchase the game.