Link: http://gamejolt.com/freeware/games/arca ... pace/1733/
Here is a rather unusual game for you. You control a ball of green light (in Outer Space) using the arrow keys. Blue balls of light will fly at you. Your goal is to destroy the blue balls of light to advance to the next level. To destroy the blue balls, you have to turn your green ball into an Electric Ball by pressing the 'A' key. If you don't do this, you will be destroyed by the blue ball when it comes in contact with you. And if your green ball is an Electric Ball for too long, the charge will burn out and you'll have to wait for your ball to get its green light back before you can turn into an Electric Ball again.
Arrow keys - control green ball
'A' key - form an Electric Ball
Also, it's likely a requirement that your computer support Pixel Shader 2.0 or higher.