Very polished!
Very sparkly. seems like everything gives off particles! maybe that's why it seemed to run a bit slow?
The gameplay was pretty solid, but fighting wave after wave of enemies can get a little repetitive- especially when there's no real reward for taking them out, and there's no particular hurry to do so. one of the appeals of most shooters is the franticness of them, where you rush to defeat as many of the enemies as possible either for an achievement or for upgrades. i suppose there's an appeal to getting your multiplier high, but it was just too easy. on every level i'd surpass the goal by so much it was laughable. Also, i find it a bit baffling that the only weapon that makes any noise is the spreadshot...
Anyway, I didn't play all the way through the game, but i blame my own impatience, not you. It's an excellent game, and you did very well.