Mental Aerobics!
This was a well built game. The puzzles are good for those that want to stretch their logical ligaments. It's got a great soundtrack; very ambient. The graphics exceed those of some professional puzzle games. Mostly, I love the story flow. The science experiment backdrop has been used, but you put a nice spin on it.
One thing I noticed was how some of your puzzles were designed to make one intentionally over-complicate their strategy. If I were to give a piece of advice for this game it would be: Keep your strategy simple.
I'd love to see a sequel of Epsilon with bigger levels and possibly multiple balls.