SO much potential...but only fun for about 15 min
Geometry wars + flow...great idea! The controls were slick as hell, and from my experience with playing flash games that is something not easily mastered and not often seen. The physics felt fluid and added a great dynamic to the game. The combat reminded me of Subspace a little, but not quite so difficult. The upgrades were cool, the variety in enemies wasn't bad, and the controls were perfect.
So why didn't you do more with it??? The game ends up being a simple, repetitive click-fest with NO fear of losing. No fear of losing equals no real intensity for a game like this...I ended up just running into everything awhile clicking as fast as possible and didn't come close to dying. I saw all of these cool looking boss-type enemies with cool homing missiles and firing patterns, but i didn't have to worry in the slightest.
In short, HARDER NEXT TIME! You have a GREAT physics/movement engine that's easy to learn but would take time to master. Good job though =)