I like the idea, and the mechanics are smooth, but daaamn it's difficult! I guess it's a control scheme you master overtime, but I wonder if it wouldn't have been clearer with a more central placement of the color-coded keys. maybe that an arrow appears in the middle of the screen, along with each color? Too easy...? Feels like you'd still need to really hone your reaction time, even if the control was more central. Good game but: hard to get into right away.