Spikeball

Arrow keys to move, space bar to extend spikes, Z and X to rotate.

Tips:

You must hit enemies with the TIPS of the spikes to kill them.

Also, if you go offscreen the health will drain VERY quickly, so avoid that at all costs.

Hint: you win a secret prize if you get 90,000 kills.

Really. And its an amazing prize. So go for it.