The games you already have are kickass. Besides that we have (some are already mentioned, but these are just my personal favorites)
-Zelda: Minish Cap. This is my favorite 2D zelda. It is... incredible.
-Ninja Five-O: this one may be hard to track down (I luckily found a copy on Ebay). What we have here is a mix between NES Ninja Gaiden, Bionic Commando grappling and some Castlevania thrown in. Do your best to find this game.
-Castlevania: Aria of Sorrow. Best metroidvania
-CV: Circle of the Moon. Pretty challenging at times, but that's part of what makes it a great game.
-WarioWare inc.
-Golden Sun: a decent rpg with some impressive visuals when it comes to battles.
and last but not least... ASTRO BOY: ZOMG FACTOR. this is one of the finest action games on the system. Besides that there are the Mario ports and zelda: alttp, a game that still hasn't aged a day and is as awesome as ever.
I would advise against the purchase of drill dozer since it is overrated and really not all that fun.
