Runs pretty smooth and the multiplayer seems to work fine (though Quick Play dropped me into an empty game the first time). Giving the bullets a black outline is a good move because I cannot make sense of the rest of the visuals - horribly low contrast and super noisy, almost random use of color.

Seems to play pretty well other than the issues created by the indecipherable visuals though. I think multiplayer makes this kind of game more engaging, but you need to take steps to overcome the visual confusion and tendency to be overwhelmed when there are 4 players worth of bullets and special effects flying around the screen.