I must Highly Recommend
This is definitely a top notch flash game loop for all sorts of action games in various genres. Not only does it sound great, but it also has a relatively seamless loop to it, meaning the end flows pretty well into the beginning (not perfectly, but as background music it needn't be perfect).
However, if I may offer a tip to you. Most flash gamers are notorious for muting anything that's even remotely annoying, and this *could* be annoying to some people. The best way I've found to avoid that is to reduce the volume level on the continuous "ssss" sounds on the drums, and also reduce the volume of all of the sounds in the higher registers. In general, the more the loop leans toward having slightly louder bass, the better.
Of course take this tip with a grain of salt, do with your music what you want.
~FP