Need some sugeestions on some good xbox live arcade games

I want to get a few arcade games, and I was just wondering what all your opinions are on the best ones. It doesn't matter what genre, just hoping for a few suggestions. Cheers

Braid was an amazing puzzle game. Worth the 1,200 points.

Geometry Wars Evolved 2 is awesome.

Castle Crashers is an alright game.

If you HAVENT got BRAID, Thats the FIRST thing you get!
Castle Crashers and Alien Hominid is good,

Off the top of my head they are the first 3, I've only got about 8 due to recently getting online with it,

BUT you can always get the demo's, ALWAYS test before ya buy