Nanostray is excellent. Picked that up when there was rumours of Shin'en going bankrupt, wanted to get me one of those sought after rare shmups. But that was a dirty lie and it's hitting europe now or soon.
I'd say Mario 64 DS is better. It's just got more. the characters add a real depth to it, plus its closer to what Shigsy originally wanted. You all probably know but Mario 64 is only 80% of what Shigsy wanted, he had plans for multiplayers, star road-like system and loads of other bits to make it perfect. but he dropped them! Mario DS is supposed to be a little more of that 80% with the multiplayer and extra characters like. but still. its a good game and I'm a little pissed at myself for rushing through it (all stars) in 2 weeks.
The minigames -barring Luigi's- really add a lot more to the game. they're addictive as hell. if hell was addictive.