Maple Story DS. It's an action platformer with some rpg elements. I wouldn't compare it directly to more classic metroidvanias because this is more linear. It was only released in Japan and South Korea sadly so progressing in the game could be a bit hard at times. I think there are some fantranslation around though.
A fun game that might be worth a look if you can find it and get past the language barrier.
If you're looking for platformers, I recommend the Super Mario 64 remake. Super Princess Peach isn't bad, either. If you're into puzzle-solving, I highly recommend the Layton series. They're awesome. RPG-wise, any Pokemon game or Final Fantasy remake will do. Mario & Luigi: Partners in Time is also recommended.
Disgaea DS if you want a crazy 4th wall-breaking game that will fill up your next year, so you don't need to worry about buying a new game It's about the prince of the Netherworld, Laharl, who wakes up after sleeping for 2 years. His partner in crime, Etna, has secrets to hide that make her seem to be an enemy. The Netherworld is a crazy place, where violence is the answer. Always the answer. The game has a tactical approach with battles that use a chess-like format. If you love dark humor and 4th wall breaking, then this game is for you.
Edit: Warning! The max level is 9999 and you need to get to like 5000 to beat some of the hardest enemies!