Suggestion...
Wow, I was just watching Madness this morning and I was thinking about how awesome it would be if there were a video game like it. This is awesome, but one suggestion I have is to make some kind of ducking ability so you can get low and dodge shots. In a few of the Madness episodes, for example, the main character dives backwards to avoid shots. Maybe that could be the ducking move, like when you hit "S" the guy dives backward to the ground so he can still shoot at enemies.
Otherwise it was good, but the game speed was a bit slow (quality aside)... it seemed like it was in slightly slow motion. If you made the gameplay quicker it would seem less burdensome and more action-packed.
I really liked it, just a few tweaks including the things other people have been saying in their reviews (which it sounds like you're taking heed of) and this could be an amazing game.