I believe I've stated it before, but I love top down shooters. And this is a GREAT top down shooter. I loved it, to put it simply. It was amazing.
However, even though I think it was great, there are 2 issues that I have with it -
One - I would suggest that you can always look ahead where the mouse is pointed to, instead of having to hold down a button
Two - I loved the the slow mo ability, but I think that it you shouldn't be able to have it on for an indefinite amount of time.
Apart from this, your game was a blast. Congrats on making such a polished game! :)