Pretty good could be better.
Mmmm, things that could be added to make this better:
Varying color combinations
Some kind of back ground that's not black
Perhaps some 'electrical' arc connection between the spheres, preferably of a different color or shade
Things that could be modified to make this better:
Less stark of a color combination. This is SERIOUSLY hard on the eyes. Mine still feel twitchy.
Make the point of the spheres that causes the lost life more apparent.
Make the mouse pointer invisible
It was pretty hard, but I attribute that to the colors and size of the spheres being misleading.
Pretty fun for like 8 minutes though.