Flash Element Tower Defense. I love it. Other which i also like are:

Bubble Cannon 2
Madness Combat
Fancy Pants World 1 and 2
Nina rinseout/rampage
Fpa..

i'd have to say mostly rock and indie(also hate the genre title) for me. i voted for rock. Hard rock is my least favorite genre because it may be difficult understand what the perosn is saying in the lyrics...